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Your Vehicle
Porsche // 928 (1978-1995) // 928S2 4.7L 1984-86
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- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
The Genuine Porsche Rear Support Bracket (Part Number: 98750457100) is an original equipment underbody mounting component designed for selected Porsche Boxster (987) and Porsche Cayman (987C) models.
Sold Each.
x2 Required Per Car.
Fits:
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Diagram Ref No 7
Also referred to as a Rear Underbody Support Bracket, Rear Floor Pan Support or Rear Underbody Cover Bracket, this component forms part of the vehicle's protective underbody covering assembly.
Its primary function is to provide a secure mounting and supporting point for the rear underbody cover, helping maintain the correct position and attachment of the panel beneath the vehicle.
The Porsche 987 Boxster and Cayman feature a series of underbody protection panels designed to shield components from road debris, water, dirt and other environmental contamination.
These panels also contribute to the vehicle's original underside configuration, helping maintain a smooth and properly assembled underbody surface.
The rear support bracket works alongside the underbody cover, mounting fasteners and associated retaining hardware to hold the relevant panel in its intended position.
Manufactured to Porsche's original equipment specifications, the bracket is designed to match the mounting arrangement of compatible vehicles.
Correct installation helps maintain panel alignment and reduces unwanted movement, vibration or rattling during driving.
The bracket is exposed to moisture, road salt, vibration and debris thrown up from the road surface.
Over time, it may become bent, corroded, cracked or damaged, particularly following contact with road obstacles, kerbs or incorrectly positioned lifting equipment.
A damaged or missing bracket may allow the rear underbody cover to become loose, creating unwanted noise or leaving the protective panel inadequately supported.
Replacing a worn or damaged bracket with a Genuine Porsche component helps restore the original underbody mounting arrangement and maintain secure attachment of the surrounding protective panels.
What This Product Does:
The rear support bracket is a mechanical mounting component within the underbody protection assembly.
Its primary function is to provide the specified attachment and support point for the rear underbody cover.
The underbody covering is made up of several panels secured using retaining brackets, screws, clips and nuts.
These components must be correctly installed to prevent the covers from shifting or vibrating while the vehicle is in motion.
The rear support bracket helps maintain the position of the protective panel and provides a reliable mounting interface.
Its main functions include:
- Supporting the rear underbody cover: Helps hold the protective panel in its intended position.
- Maintaining secure panel attachment: Provides a mounting interface for the associated underbody covering.
- Reducing unwanted movement: Helps prevent the rear underbody panel from shifting during driving.
- Maintaining correct alignment: Supports the original positioning of the underbody protection components.
- Reducing rattling and vibration: Helps prevent unwanted noise from an inadequately secured cover.
- Supporting underbody protection: Keeps the relevant protective panel correctly mounted.
- Maintaining original underbody construction: Preserves Porsche's factory fastening arrangement.
- Supporting correct panel clearance: Helps maintain the intended spacing between the cover and surrounding components.
- Facilitating underbody repairs: Allows damaged retaining hardware to be replaced independently.
- Supporting vehicle restoration: Helps restore missing or damaged original mounting components.
Symptoms Of Wear Or Failure:
The rear support bracket does not contain moving mechanical parts.
Deterioration generally occurs through corrosion, impact damage, incorrect installation or repeated removal during servicing.
Common signs of wear or failure include:
- Loose rear underbody cover: The protective panel may no longer remain securely attached.
- Rattling noises beneath the vehicle: An insecure mounting point may allow the cover to vibrate.
- Visible corrosion: Rust may develop after prolonged exposure to moisture and road salt.
- Bent bracket: Impact damage may distort the original mounting shape.
- Cracked bracket: Mechanical stress may cause fractures around the component or fastening points.
- Damaged mounting holes: Elongated or distorted mounting holes may prevent secure attachment.
- Missing bracket: Previous underbody repairs may have left the original support component absent.
- Partially detached underbody panel: A damaged bracket may allow the protective cover to drop away from its normal position.
- Uneven panel alignment: The rear underbody cover may no longer sit correctly against adjoining panels.
- Scraping or contact noises: A loose cover may make contact with the road or neighbouring components.
- Excessive panel movement: The cover may move when inspected by hand.
- Damaged retaining hardware: Corroded or missing nuts and screws may affect the bracket's attachment.
- Visible impact damage: Contact with speed bumps or road obstacles may deform the bracket.
- Poor fitment after servicing: Incorrect reassembly may leave the bracket misaligned.
- Damage around the mounting points: Cracked surrounding panels or damaged fixings may indicate an insecure support arrangement.
Why Replacement Matters:
Replacing a damaged rear support bracket helps maintain the correct installation of the Porsche Boxster or Cayman rear underbody protection panel.
A corroded, bent or cracked bracket may no longer provide adequate attachment for the underbody cover.
Continued driving with a loose cover may result in additional vibration, damaged mounting points or contact with surrounding components.
In severe cases, an inadequately secured underbody panel may partially detach.
Installing a Genuine Porsche replacement Rear Support Bracket helps to:
- Restore secure underbody cover attachment: Replace damaged or missing support hardware.
- Maintain original panel positioning: Help ensure the protective cover fits correctly.
- Reduce rattling and vibration: Address unwanted movement caused by a defective mounting bracket.
- Prevent further panel damage: Restore support before additional mounting points deteriorate.
- Maintain underbody protection: Keep the protective panel securely positioned.
- Replace corroded components: Renew brackets affected by moisture and road salt.
- Support correct panel alignment: Restore the intended fastening arrangement.
- Reduce the risk of panel detachment: Address insecure underbody mounting points.
- Support bodywork refurbishment: Replace damaged components during underside repairs.
- Maintain original Porsche construction: Preserve the factory-designed underbody assembly.
- Avoid unsuitable mounting modifications: Use the specified Porsche component rather than improvised brackets.
- Support long-term vehicle maintenance: Keep the underbody protection system properly assembled.
- Maintain Genuine Porsche quality: Use original equipment replacement hardware.
Replacement is recommended when the bracket is cracked, severely corroded, distorted, missing or unable to secure the underbody cover correctly.
If the protective cover or its mounting points are also damaged, those components may require separate replacement.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98750457100
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Underbody Protective Undertray Panel
High-quality, precision-fitting underbody protective panel designed for Porsche 928 models up to model year 1986.
This authentic undertray plays a crucial role in protecting
the underside of the vehicle while also improving aerodynamic airflow. Often
overlooked during maintenance, original panels are frequently missing or
damaged due to age or contact with road surfaces.
Fits:
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Diagram ref no 16
Manufactured from powder-coated aluminium, this replacement panel offers excellent durability, corrosion resistance, and long-term protection—making it ideal for restoration or replacement of worn or missing underbody components.
Key Features
• Direct replacement underbody panel
• Suitable for Porsche 928 (up to 1986)
• Precision fit for OEM-style installation
• Powder-coated aluminium construction
• Improves airflow under the vehicle
• Reduces wind noise and turbulence
• Durable and corrosion-resistant
Function and Purpose
This undertray is an essential part of the vehicle’s underbody system.
It helps to:
• Protect critical components from debris and damage
• Improve aerodynamic airflow beneath the car
• Reduce wind noise at speed
• Support overall vehicle efficiency and performance
Why Replace Your Undertray Panel
Underbody panels are often damaged or missing over time.
Common issues include:
• Cracks or deformation from road contact
• Missing panels due to previous repairs
• Increased wind noise
• Reduced aerodynamic efficiency
Replacing the panel restores both protection and original driving characteristics.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92850494104
The product you are viewing cross references to these numbers
Complete underbody trim. This genuine underbody lining replaces a damaged, distorted or missing factory panel.
Fits
- 958 Cayenne V6 3.6L Petrol (300Hp) 2010–17
- 958 Cayenne V6 3.0L Diesel (245Hp) 2010–17
- 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010–17
- 958 Cayenne S V8 4.8L Petrol (400Hp) 2010–17
- 958 Cayenne S V8 4.2L Diesel (382Hp) 2010–17
- 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010–17
- 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010–17
- 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010–17
Catalogue diagram position: 16
What This Product Does
The lining forms the complete section of the original underbody trim assembly. It covers the corresponding area beneath the vehicle, helping limit exposure of adjacent components to water, dirt and road debris while maintaining the intended arrangement of the factory underbody panels.
Functions
- Restores the section of the underbody lining
- Provides a barrier against dirt, water and road debris
- Supports the original underbody panel layout
- Replaces a cracked, distorted, loose or absent panel
Technical Details
- Catalogue description: underbody trim, complete
- Required quantity shown in the diagrams: 1
- Recorded weight: approximately 1.106 kg
Symptoms of Fault
- Visible cracking, splitting or sections missing from the lining
- Loose edges or broken attachment points
- Rattling or fluttering sounds when the vehicle is moving
- A warped panel sitting below the surrounding underbody
- Scraping caused by the trim contacting the road
- Absent or damaged retaining nuts, screws or clips
Why Replacement Matters
A broken or missing lining exposes the surrounding underside to increased contamination and stone impact. Renewing the panel restores the original coverage and helps prevent loose trim from moving or dragging. Check the mounting locations, expanding nuts and panel bolts during installation, replacing damaged fasteners where necessary so the new lining can be secured correctly.
FAQs
- Which side is this trim for?
It is the complete underbody lining identified in the Porsche parts diagrams. - Is it listed for both pre-facelift and facelift vehicles?
Yes. The supplied diagram data includes Cayenne 92A applications up to 2014 and from 2015 onwards within the stated 2010–17 coverage. - Are retaining clips and bolts supplied?
The inclusion of fixings is not specified. Inspect the existing expanding nuts, screws and mounting points before installation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9585042
The product you are viewing cross references to these numbers