OE Match

Porsche Hydraulic Drive Cylinder Cabriolet Roof | Reliable Roof Operation & Precision Engineering
The Hydraulic Drive Cylinder for Porsche 996 and 997 Cabriolet models is a crucial component in the convertible roof mechanism. It powers the smooth, synchronized opening and closing of your Porsche’s soft-top system, ensuring fluid motion and quiet operation every time you retract or raise the roof.

Fits:

• Porsche 996 C2 Cabriolet 3.4L 1997-08/01
• Porsche 996 C4 Cabriolet 3.4L 1997-08/01
  
• Porsche 996 C2 Cabriolet 3.6L 09/01-2005
  
• Porsche 996 C4 Cabriolet 3.6L 09/01-2005
  
• Porsche 996 C4S Cabriolet 3.6L 09/01-2005
  
• Porsche 996 TURBO Cabriolet 2000-05
  
• Porsche 997 MK1 Carrera Cabriolet 2 3.6L 2005-08
  
• Porsche 997 MK1 Carrera 2S Cabriolet 3.8L 2005-08
  
• Porsche 997 MK1 Carrera 4 Cabriolet 3.6L 2005-08
  
• Porsche 997 MK1 Carrera 4S Cabriolet 3.8L 2005-08
  
• Porsche 997 MK1 TURBO Cabriolet 2007-09
  
• Porsche 997 MKII Carrera C2 Cabriolet 3.6L 2009-12
  
• Porsche 997 MKII Carrera C4 Cabriolet 3.6L 2009-12
  
• Porsche 997 MKII Carrera C2S Cabriolet 3.8L 2009-12
  
• Porsche 997 MKII Carrera C4S Cabriolet 3.8L 2009-12
  
• Porsche 997 MKII Turbo Cabriolet 2010-13

Diagram ref no 12

At Design911, we supply high-quality hydraulic cylinders manufactured using advanced materials and precision seals, these cylinders are designed to withstand the hydraulic pressures and temperature variations encountered in everyday use.

Whether you’re restoring a Cabriolet roof system or replacing a leaking unit, this part ensures dependable operation and preserves your Porsche’s refined driving experience.

What Does a Hydraulic Drive Cylinder Do?
The hydraulic drive cylinder is responsible for powering the motion of your Porsche Cabriolet roof through hydraulic pressure.

Core Functions:

• Converts hydraulic fluid pressure into mechanical movement to raise or lower the roof.
• Ensures smooth, balanced motion between both roof sides.
• Maintains alignment and tension of the roof mechanism.
• Works in tandem with pumps, lines, and valves for seamless operation.

Without a functioning cylinder, the roof system cannot move properly, often resulting in uneven motion or complete failure.

Why Do Hydraulic Cylinders Fail or Leak?
Over time, wear, heat, and hydraulic pressure take their toll on the seals and internal components.

Common Causes of Failure Include:

• Hydraulic fluid leaks from worn or cracked seals.
• Contamination or debris damaging the internal piston.
• Age-related degradation of rubber components.
• Air ingress into the hydraulic system causing pressure loss.
• Corrosion or mechanical damage from extended use or storage.

When a cylinder fails, symptoms can include slow or jerky roof operation, fluid leaks in the rear compartment, or complete hydraulic system failure.

Why Replace Your Porsche Hydraulic Drive Cylinder?
Replacing your hydraulic drive cylinder restores full convertible roof functionality and protects the entire hydraulic system from strain or damage.

Key Benefits:

• Restores smooth, reliable Cabriolet roof operation.
• Prevents hydraulic leaks and loss of pressure.
• Protects pumps and lines from premature wear.
• Precision-engineered for Porsche 996 and 997 fitment.
• Manufactured using high-grade seals and corrosion-resistant materials.
• Designed to perform under high hydraulic load and temperature variation.

Replacing worn hydraulic cylinders ensures your roof operates as intended — with quiet, consistent, and leak-free performance.

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99756194502

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Hexagon-head bolt, M 14 x 1,5 x 120
The bolt connects the front tong shape arm to the cross member.
Sold each.

Fits:
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.2 Cayman 2009 - 2012
Porsche 997.2 Carrera 2009 - 2012
Porsche 997 Turbo 2007 - 2009
Porsche 997.2 Turbo 2010-2013
Porsche 997 GT3 2007 - 2011

Diagram ref no 7

Specifications:
• Thread: M14 × 1.5
• Length: 120 mm
• Head: Hexagon-head bolt
• Application: Front control arm / track-arm mounting

The front control arm mounting bolt is under significant load from braking, cornering and road surface irregularities. Over time, original bolts may become stressed, fatigued, corroded or incorrectly reused - leading to potential loosening, suspension misalignment or premature bushing/arm wear.

When to Replace:
• During front suspension removal or control arm replacement/re-bushing.
•  If the original bolt is corroded, thread-worn, stretched or has been reused many times.
•  When the car is being restored or upgraded, and you want to ensure correct hardware integrity.

Installing the correct bolt ensures factory-spec clamping force, correct alignment, and long-term reliability of the front suspension geometry.

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99907205001

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Control Arm Eccentric screw M 12 x 105. Rear Axle.
This is an eccentric adjustment screw used in the suspension system of Porsche 986 Boxster, 987 Boxster, and 987 Cayman models. This precision-engineered  replacement bolt provides the correct geometry and adjustment range for rear or front control arm alignment, allowing proper camber and toe settings.
Sold each.

Fits:
Porsche 986 Boxster 1997-04 F 98XS6 01536>>
Porsche 987 Boxster 2005 - 2008
Porsche 987 Cayman 2005 - 2008

Diagram ref no 12

• Function:  This bolt features an eccentric cam design that enables fine adjustment of suspension geometry. It’s critical for setting camber and toe angles, ensuring your Porsche tracks straight and maintains optimal tire contact for cornering grip and stability.

•  Why Replacement Matters: Over time, eccentric bolts can seize, corrode, or deform due to constant exposure to road conditions and torque load. When this happens, alignment accuracy suffers, and adjustment becomes difficult or impossible.

•  When to replaces: During suspension servicing or alignment work,  When replacing control arms or bushings, If the original bolt is frozen, bent, or corroded

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99633121705

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Hexagon head bolt front control arm, M14 x 1,5 x 95.
This bolt secures the front control arm (also known as the wishbone or track bar) to the chassis/frame or suspension assembly. The correct bolt ensures the arm remains fixed under load, maintains suspension geometry, and withstands vibration and stress  
Sold each - 2 required per car.

Fits:
Porsche 987 Boxster - 2005 to 2012
Porsche 987 Cayman - 2006 to 2012
Porsche 997 - 2005 to 2012
Porsche 997 turbo - 2007 to 2012
Porsche 997 GT3 - 2007 to 2011

Diagram ref no 11

Specification: M14 × 1.5 thread, length 95 mm
Replacement reference: 90037827909 → 90037827901

Control arm mounting bolts endure high forces from cornering, braking, and road irregularities. A bolt that’s worn, corroded, or reused may not hold correct torque or clamping force - compromising alignment and suspension performance.

When to Replace:
• During front suspension removal, control arm replacement or realignment.
• If the original bolt shows corrosion, thread damage, or distortion.
• As part of preventative maintenance on high-performance or heavily used vehicles.

Using a new bolt restores proper torque specification, secure mounting and ensures your Porsche’s suspension operates reliably and precisely.

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90037827901

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Gearbox silencer block Hexagon-head bolt. M12 x 1.5 x 100.
Engineered to match the original Porsche specification, this high-quality bolt ensures correct fit, strength, and finish for secure attachment of the gearbox silencer block on the Porsche 993 Carrera 2 .
Sold each.

Fits:
Porsche 993 C2 1994-98 MANUAL (Gearbox type G50.20 / G51.21)
Porsche 993 Carrera RS 1995 MANUAL (Gearbox type G50.31 / G50.32 / G50.33)
Porsche 993 C2 1994-98 TIPTRONIC (Gearbox type A50.04 / A50.05)

Diagram Ref No 15.

Bolts used in drivetrain and gearbox assemblies are exposed to continuous vibration, torque stress, and environmental factors such as heat and corrosion. Over time, these conditions can weaken or stretch the bolt, reducing its ability to maintain proper clamping force. Using a degraded or mismatched bolt can cause mounting misalignment, vibration, or even component failure under load.

When to replace:
• During gearbox or silencer block removal, when original bolts show corrosion, wear, or damaged threads.
•  As part of drivetrain servicing or restoration, ensuring all fasteners meet factory torque and material specifications.
•  Whenever hardware is reused or mismatched, to maintain the correct preload and structural integrity of the assembly.

Replacing this hexagon-head bolt guarantees the proper tensile strength, precise thread pitch, and corrosion resistance — restoring safe, vibration-free mounting performance in your Porsche 993 Carrera 2 or related 911 model.

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90037808801

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Brake caliper Hexagon-head bolt,  M12 X 1.5 X 40
Front or rear fixed caliper mounting bolt – used to secure the caliper to the mounting bracket or hub carrier. This high-quality hex-head bolt is designed for caliper mounting applications on Porsche vehicles, including the 924, 944 and 968 series. It matches the original specification (M12 × 1.5 × 40 mm)
Sold each.

Fits:
Porsche 924 S 1986 - 1988  FRONT CALIPER
Porsche 944 / 944 S 1982 - 1989 FRONT CALIPER
Porsche 944 TURBO 1985 - 1991 REAR CALIPER
Porsche 968 1992 - 1995 REAR CALIPER

Diagram ref no 10

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PCG0401081

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Front / Rear bumper hex nut, M8.
Hex nut for the front or rear bumper mounting assembly on Porsche 911 (1974–1989) models. Manufactured to match Porsche specifications, this M8 hex nut ensures accurate fitment, strong clamping force, and long-lasting durability for your bumper installation or restoration.
Sold Each.

Fits:
Porsche 911 G-models 1974 - 1989
Porsche 930 Turbo 3.0L, 3.3L 1975 - 1989

Diagram Ref No 15 (Front bumper) / no 22 (Rear bumper)

This hex nut fastens the bumper brackets and mounting hardware to the chassis structure. Its precise thread pitch and corrosion-resistant finish ensure consistent torque retention, reliable alignment, and vibration-free bumper support in all driving conditions.

Over time, moisture, vibration, and age can cause original hardware to rust, seize, or lose clamping strength. Aged nuts may compromise bumper alignment or make disassembly difficult during service or repainting.

When to Replace:
• During front or rear bumper removal, alignment, or restoration.
• If existing hardware is rusted, stripped, or corroded.
•  As part of preventive maintenance during bodywork or repainting.


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90008400402

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Complete Intake Connection Assembly.
Restore or upgrade the air intake plumbing on your classic Porsche 911 with this complete intake connection assembly. Designed for models with MFI/mechanical fuel injection, this intake pipe links the throttle/air-intake stack to the intake manifold, ensuring accurate airflow, reliable metering and correct fitment.
Sold Each.
x2 Required Per Car.
Fits Left And Right.

Fits:

• Porsche 911 1972-1973 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L

Diagram Ref No 12

What This Product Does:

• The intake pipe (or intake connection) is a critical component in the engine’s air delivery system: it connects the throttle body, intake stack or air intake system to the intake manifold of the engine.
• It ensures a smooth, sealed, correctly shaped passage of air (and in the case of injection, the air-fuel mixture) into the cylinder head, maintaining correct airflow, avoiding leaks or turbulence that could upset fuel/air metering or engine response.
• On the era of 911 referenced (MFI mechanical fuel injection), proper intake piping is important for correct function of the injection system, throttle response, and overall engine performance.

Symptoms Of Wear, Damage Or When Replacement Matters:

• Air leaks or a hissing sound around the intake pipe, which can upset the injection/air-metering system, cause poor running, unstable idle or reduced performance.
  
• Poor throttle response, hesitation or mis-firing — if the pipe is cracked, partially blocked, or has missing components, it can degrade engine performance.
  
• Cracks, corrosion, or broken mounting tabs visible on the pipe or its flanges — especially for older vehicles where plastic/metal parts have aged.
  
• Difficulty fitting or aligning connections between the throttle stack and manifold — if the pipe is out of shape or damaged, it may be difficult to achieve correct installation or clean sealing.
  
  

Why Replacement Matters:

• Ensures correct airflow and engine performance: A damaged or sub-standard intake pipe can compromise air delivery, disrupt mixture control, and reduce engine efficiency or driveability.
  
• Improves reliability: Old or worn intake components can lead to leaks, performance issues or even engine damage (if mixture is upset or induction temperatures become erratic). Replacing with a correct part restores the system.
  
• Simplifies installation: Buying a “complete” intake connection (rather than patching multiple smaller pieces) saves installation time, reduces risk of missing parts, and ensures compatibility.
• Ensures fitment integrity: In older vehicles, mounting points may have degraded—installing a new pipe with correct flanges/hardware ensures everything aligns properly, reducing stress or potential leaks.

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91111006302

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Cotter pin nut for wishbone ball joint front.
Designed for the front wishbone (control arm) ball joint. Engineered to original Porsche specifications, this nut ensures safe, reliable fastening of the lower ball joint to the suspension arm on Porsche 911 and 914  models.
Sold each. Fits left and right.

Fits:
Porsche 911 1969 - 1989
Porsche 914 1972 - 1976

Diagram ref no 22

The cotter pin nut fastens the lower ball joint to the front suspension arm and secures it with a locking cotter pin through the castle slots. This prevents the nut from rotating loose, maintaining safe steering and suspension geometry during operation.

Over time, nuts can wear, corrode, or lose torque retention due to repeated assembly, age, or exposure to moisture and road debris. A weakened or reused nut may compromise the ball joint’s security, leading to excessive play or unsafe suspension movement.

When to Replace:
• During front suspension rebuilds or ball joint replacement.
• If the original nut is rusted, damaged, or has distorted threads.
• Whenever the cotter pin is replaced, ensuring proper torque and locking function.

Replacing a new cotter pin nut restores factory-level safety, alignment integrity, and reliability in your classic Porsche’s suspension system.

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90008400402

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Number plate holder / license plate screw.
This screw is ideal for both front and rear plate mounting, providing secure retention without damaging the bumper or bracket. Designed to the same dimensions and finish as the factory fasteners, it ensures a perfect fit and clean, original appearance for Porsche 964, 993, 996, and 986 Boxster models.
Sold each.

Fits:
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 1998 - 2004
Porsche 986 Boxster 1997 - 2004

Diagram ref no 23.

Over time, exposure to moisture, dirt, and road salts can cause number plate screws to corrode, seize, or strip their threads, making them difficult to remove or reinstall.

When to replace:
•  When refitting or replacing number plate brackets.
•  If the original screws are rusted, damaged, or missing.
•  During restoration or bumper replacement to preserve factory-correct detailing.

Installing new screws guarantees a perfect fit, clean finish, and long-lasting corrosion resistance, keeping your Porsche’s license plate securely and neatly mounted.

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90007301301

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Hexagon nut - M8 - for motorsport control arm. 
It designed for Porsche 996 & 997 GT2 / GT3 front and rear control arm assemblies. Manufactured to Porsche specifications, this nut provides secure fastening under extreme load, vibration, and heat - ideal for both road and track applications.
Sold individually, x2 required per arm.

Factory Fit:
Porsche 996 GT2 2001-05
Porsche 996 GT3 1999-05
Porsche 997-1 GT2 2007-09
Porsche 997 GT3 2007-11

These washers are also required when upgrading from the standard control arm to the motorsport control arm on the following Porsche models:
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05

Diagram ref. 26.

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90007606402

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Gearbox Mounts Hexagon-Head Bolt Nut. M 8.
Gearbox mount hexagon-head bolt nut (part number 90007606402), designed for Porsche 911, 912, and 930 models (1965–1989). Manufactured to match original Porsche specifications, this M8 nut provides precise thread engagement, corrosion resistance, and dependable fastening strength for gearbox mounting applications.
Sold each.

Fits:
Porsche 911/912 1965 - 1989
Porsche 911 (930) Turbo 1975 - 1989

Diagram Ref No 9

Ideal for gearbox mount installations, transmission rebuilds, or hardware restorations on classic air-cooled Porsche models.

Over time, gearbox mounting hardware can corrode or lose torque retention due to heat, vibration, and age. A fresh nut ensures secure fastening and proper alignment of gearbox mounts. Replace during gearbox removal, rebuild, or mount replacement to maintain reliability and prevent drivetrain movement or noise.


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90007606402

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Door check strap pin. 
This pin is used in the door check strap assembly of classic Porsche 911 series vehicles. It functions as the pivot/anchor pin that allows the door check strap to engage and hold the door at predetermined open positions, limiting door swing and preventing damage to the door or hinge.
Sold each, required 2 per vehicle.

Fits:
Porsche 911 1972 - 1989
Porsche 964 1989 - 1994
Porsche 993 1994 - 1998

Diagram ref no 14.

This product supersedes Porsche's old part numbers:
• 90030903202, 91153127500, 91153127501, 91153127502

• Position: Door check strap assembly within the door hinge/frame area
• Quantity: Typically one pin per door; two per vehicle
• Benefit: Restores correct door check strap operation, limits door swing, maintains secure open positions

Over time, the door check strap pin can suffer from wear, corrosion or loosening, causing the door to move loosely, swing too far, or fail to hold open - potentially damaging the hinge or bodywork.

Replace this pin:
• During door hinge, check strap or body-work repair
• When the door no longer holds in the open position or opens too freely
• As part of restoration on high-mileage or older Porsche models where hinge hardware has worn

Replacing the correct pin helps restore the door’s controlled motion, prevents damage, and keeps the classic Porsche door operation crisp and safe.


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91153127502

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