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Side Sill Trims
This Porsche Genuine OE Expansion Rivet is a factory plastic push-type fastening clip designed for securing the door sill step plate / threshold trim. Commonly referred to as a plastic rivet, expanding rivet, or trim clip, this component is widely used in classic Porsche models for fastening interior and exterior trim panels.
Sold individually, Typically multiple required per vehicle
Fits:
Porsche 911 1965 - 1973
Porsche 914 1970 - 1976
Diagram ref no 29
It replaces earlier reference 99959152640 and is supplied individually.
This is a multi-use trim fastening clip, also used in other interior applications depending on model and configuration.
This expansion rivet is inserted into pre-drilled holes and expands when pushed into place, locking the door sill plate or trim strip securely to the bodywork.
It provides a firm hold while allowing easy installation and removal, making it ideal for trim components that may require periodic servicing or replacement.
Functions & Technical Role
• Trim fastening: Secures door sill step plates and threshold trims
• Expansion locking design: Expands inside mounting holes for secure retention
• Vibration resistance: Prevents movement, rattling, or loosening of trim
• Non-corrosive material: Plastic construction resists rust and environmental damage
• OEM precision: Designed to Porsche specifications for correct fit and grip
Fitment / Position on car
• Fitting position: Interior / body trim
• Location: Door sill step plates (threshold trims) / Rocker panel trim strips / Interior trim panels (various applications)
Trim clips are often overlooked but are critical for maintaining proper fit and finish. Over time, they can:
• Become brittle or break
• Lose tension and fail to hold trim securely
• Be lost during removal or restoration work
A worn or missing rivet can lead to:
• Loose or rattling sill trims
• Poor alignment of interior panels
• Reduced overall finish quality
Replacing with genuine Porsche OE rivets ensures secure trim mounting and preserves the original appearance of the vehicle.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99959155040
The product you are viewing cross references to these numbers
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
- Porsche Cayman GT4 Clubsport
- Porsche Cayman GT4 RS Clubsport 2020-2024
Genuine Porsche black door sill plate / scuff plate without illumination for Porsche 718 Cayman Coupe, GT4 and GT4 RS models. This original Porsche sill trim panel fits in the door opening, helping protect the sill area from scuffs while providing the correct factory interior trim finish.
Fits
- Porsche 981C Cayman GT4 3.8L 2015–16
- Porsche 982 Cayman GT4 2019>>
- Porsche 982 Cayman GT4 Clubsport
- Porsche 982 Cayman GT4 RS Clubsport 2020–24
Diagram: 807-015, item 5 — 981C Cayman GT4 2016.
Diagram: 8.8-12, item 25 — 982 Cayman GT4 Clubsport 2019–2020.
Diagram: 8.8-12, item 27 — 718 Cayman GT4 RS Clubsport 2020–2024.
What This Product Does
The strip covers the sill surface alongside the doorway, completing the entry area's trim. Its scuff-plate function helps shield the covered paint from footwear contact during access to the cabin.
Functions
- Covers the exposed sill beneath the doorway.
- Completes the transition between surrounding trim surfaces.
- Provides a sacrificial contact surface against everyday scuffing.
- Replaces a missing, cracked or visibly worn sill strip.
Technical Details
- Brand: Porsche
- Genuine sill trim/scuff plate
- Finish: Black
- Left references: 981504467801E0 / 981504467811E0
- Right references: 981504468801E0 / 981504468811E0
Symptoms of Fault
- Heavy scratches, fading or worn contact surfaces.
- Cracking or distortion beside mounting locations.
- Loose trim accompanied by rattling.
- Uneven alignment with neighbouring panels.
- Damaged or missing attachment hardware.
Why Replacement Matters
Renewing damaged sill trim restores the finish around the doorway and replaces the worn protective surface. Check the panel beneath and all mounting points first, as replacement trim cannot remedy distorted bodywork or failed supporting fixings.
FAQs
Which references identify each side?
The Left options are 981504467801E0 and 981504467811E0. The Right options are 981504468801E0 and 981504468811E0. Confirm the exact reference against your vehicle before selecting.
Are clips or fasteners supplied?
Hardware contents are not specified. Inspect the existing attachments and establish whether separate replacements are needed.
What should I check during installation?
Confirm the vehicle derivative, required side and applicable PR markings. Prepare a clean mounting surface, inspect neighbouring trim and leave any drainage paths unobstructed.
Check fitment for your specific vehicle (model, year, engine) before ordering.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98150446
The product you are viewing cross references to these numbers
Porsche Side Sill & Step Trims | Precision Interior & Exterior Finishing Components
Side sill and step trims are the finishing touch that bridge style and protection in your Porsche’s design. These trims protect the lower door openings and sill areas from scuffs, scratches, and dirt while adding a polished, premium appearance to your interior and entryway. Over time, constant use and exposure to the elements can cause damage or fading — making replacement essential for maintaining your Porsche’s visual and structural integrity.
At Design911, we supply high-quality side sill and step trims crafted to meet or exceed original specifications. Manufactured from durable materials such as aluminium, stainless steel, or carbon fibre, our trims ensure perfect fitment, long-term protection, and an elegant aesthetic.
Whether you’re restoring a classic 911 or upgrading a modern Cayenne, our sill trims combine functional protection with refined Porsche styling.
What Do Side Sill / Step Trims Do?
Side sill and step trims serve both protective and aesthetic roles in your Porsche, combining practicality with design excellence.
Core Functions:
- Protect painted sill areas from scratches, scuffs, and dirt.
- Provide a clean, finished transition between door and floor areas.
- Reinforce door sill structure and mounting strength.
- Enhance interior and exterior design with metal or logo-embossed finishes.
- Prevent corrosion and wear in high-traffic entry points.
A properly fitted sill trim maintains the sleek, premium appearance Porsche interiors are known for while safeguarding bodywork.
Why Do Side Sill / Step Trims Wear or Fail?
Despite their durability, sill trims are among the most exposed parts of your Porsche’s bodywork and interior.
Common Causes of Damage Include:
- Repeated foot traffic causing scuffs or wear.
- Fading or discolouration from UV exposure.
- Cracks or deformation due to impact or temperature changes.
- Corrosion or pitting on metal sill plates.
- Loose or broken clips and mounting points.
Damaged or faded sill trims not only detract from your Porsche’s appearance but can also allow moisture to penetrate, leading to corrosion or further wear.
Why Replace or Upgrade Your Porsche Side Sill Trims?
Replacing worn or damaged sill trims restores your Porsche’s clean, refined appearance while protecting against further wear. Upgrading to premium or branded sill plates can also enhance the look and exclusivity of your interior.
Key Benefits:
- Restores the polished appearance of door sills and entry points.
- Protects against scuffs, dirt, and moisture.
- Available in brushed aluminium, stainless steel, or carbon fibre.
- Compatible with Porsche 911, Boxster, Cayman, Panamera, Macan, and other models.
- Easy installation with direct-fit mounting clips.
- Ideal for restorations, refurbishments, or aesthetic upgrades.
High-quality sill trims add both protection and style — preserving your Porsche’s premium look for years to come.
Highlights
- Precision-crafted Porsche sill and step trims.
- Durable, corrosion-resistant materials for long-term performance.
- Protects lower door openings from wear and damage. Enhances cabin and exterior design aesthetics.
- Direct-fit replacement for classic and modern Porsche models.
- Perfect for restorations, detailing, and upgrades.
