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Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://www.design91.uk/images/schemaLogo.png https://www.design91.uk/images/schemaLogo.png +443456003478 https://www.design91.uk Facebook Instagram
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Porsche > 928 (1978-1995) > 928GT 5.0L 1989-91 > Chassis / Bodywork >

Undertrays Chassis & Engine

Undertrays Chassis & Engine

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Front Engine Undertray Protective Plate. Porsche 928 - 92850402102
2
Front Engine Undertray Protective Plate. Porsche 928
Special Order item
92850402102
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Product Information
Front Engine Undertray Protective Plate.

Fits:
Porsche 928 1987-95

Diagram ref no 27

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Related, superseded, cross reference or alternative numbers for comparison.

92850402102
92850402102

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Repair Kit Front Engine Undertray Protective Plate. Porsche 928 S4 / GT / GTS - 92850402102 - L1142.SET
7
Repair Kit Front Engine Undertray Protective Plate. Porsche 928 S4 / GT / GTS
92850402REP/1
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Product Information

Undertray Repair Support Kit – Strong, Cost-Effective Undertray Fix

Has your Porsche belly pan or bottom plate developed broken or cracked mounting supports? This is a common issue we regularly see in our Design911 workshop. Over time, road debris, speed bumps, improper jacking, and general wear can cause the original undertray mounting points to snap or weaken.

Fits:

  • Porsche 928 S4 5.0L 1987-92
  • Porsche 928 GT 5.0L 1989-91
  • Porsche 928 GTS 5.4L 1992-95

Repair kit for diagram ref no 27

Instead of replacing the entire belly pan – which can be expensive – our heavy-duty Porsche belly pan repair support kit provides a simple, strong and long-lasting solution.

What These Repair Supports Do

The original plastic mounting tabs on Porsche undertrays are prone to failure. When they break, the belly pan can sag, vibrate, or become loose, affecting:

• Underbody protection
• Aerodynamics
• Cooling airflow management
• Overall vehicle stability at speed

Our 3D laser-printed nylon repair supports reinforce and replace the failed mounting points. They restore secure attachment of the bottom plate to the chassis, preventing further damage and eliminating rattles or movement.

Why Upgrade to This Repair Kit?

Cost Saving Alternative
A brand-new Porsche belly pan or undertray panel can be costly. This repair kit allows you to fix only the damaged support areas instead of replacing the full panel.

Stronger Than Original
Manufactured from high-strength, flexible 3D laser-printed nylon, these brackets are designed to be more durable than the factory mounting tabs. They resist cracking, vibration fatigue, and road impact stress.

Workshop-Proven Solution
Developed after repeatedly seeing broken undertray supports in our own workshop, this kit is a practical, real-world tested fix trusted by Porsche specialists.

Complete Installation Hardware Included
Each set includes 8 nuts, bolts and washers per side, ensuring secure fitment and straightforward installation.

Ideal For:

• Porsche owners with cracked or broken undertray mounts
• Vehicles with sagging belly pans
• Performance or track cars exposed to higher underbody stress
• Preventative upgrades when replacing or servicing the under




Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

92850402REP
92850402102

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
About Undertrays Chassis & Engine

Protect your Porsche’s vital components and optimise aerodynamics with genuine Porsche and reproduction undertrays for the chassis and engine from Design911. These panels are designed to shield the underbody and engine bay from debris, water, and road damage, while also improving airflow and vehicle stability at speed.

Each undertray is precision-manufactured to OEM specifications, ensuring perfect fitment, structural strength, and long-term durability. Whether replacing a damaged belly pan or restoring a classic Porsche’s underbody, our selection includes factory-original and high-quality reproduction undertrays to suit every model - from early air-cooled 911s to the latest Taycan and 992 series.

Constructed from lightweight yet durable materials such as ABS plastic, aluminium, or composite blends, these panels combine protection, performance, and authenticity to keep your Porsche in peak condition.

Genuine Porsche Undertrays
Factory-original undertrays built to Porsche’s exact specifications. Offer superior fitment, durability, and aerodynamic precision.

Reproduction Undertrays & Panels
High-quality reproduction alternatives offering OEM-grade protection and compatibility for a range of Porsche models - ideal for restorations.

Engine Undertrays & Guards
Protect the engine bay from dirt, heat, and road debris. Designed for easy installation and improved airflow efficiency.

Chassis Undertrays & Belly Pans
Full-length chassis panels that reduce drag and shield underbody components, maintaining Porsche’s factory aerodynamic performance.

Mounting Brackets & Fixing Hardware
OEM-spec clips, screws, and brackets required for secure undertray installation, ensuring a vibration-free and stable fit.

Classic Porsche Underbody Panels
Authentic reproduction undertrays and guards for heritage models such as the 911 Classic, 964, and 993 — essential for concours restorations. 

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