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Side Sill Seals
The kit includes four precision-formed aluminium strips that fit directly into the door sill areas on both sides of your Porsche 356. These threshold trims mount over the carpet at the lower door openings, offering a classic polished look that matches the vehicle’s original styling.
Fits:
Porsche 356 Speedster / Roadster 1950 - 1965
Diagram ref no 53 and 59
This kit includes two wide and two narrow aluminium strips to cover both door entry sills on your vehicle.
Threshold kit includes:
- 2 Wide aluminium strips (OE ref no 64455111700)
- 2 Narrow aluminium strips (OE ref no 64455111900 / 64455112000)
The aluminium door sill threshold strips serve both a protective and aesthetic function. They shield the painted door sill and interior carpet edge from scratches, shoe marks, and general wear during vehicle entry and exit. In addition, the metal finish restores the classic look and feel of a well-preserved or restored Porsche 356, providing a high-quality finishing touch to the cabin threshold.
Function
• Protects the door sill paint and carpet edges from abrasion.
• Provides a classic polished trim finish consistent with original Porsche design.
• Fits flush with the sill area for clean, restoration-ready aesthetics.
• Durable aluminium construction resists wear and moisture exposure common in classic cars.
Door sill areas on classic Porsche 356 cars receive heavy foot traffic, which can easily wear away paint, rust bare metal, and fray the carpet edge. Without proper threshold protection, dirt and moisture can also lead to corrosion over time. Installing this aluminium sill threshold kit restores classic styling, protects vulnerable surfaces, and preserves interior value - especially important for restorations or classic-car presentations.
Replace your door sill trims if:
• The existing aluminium strips are worn, dented, or corroded
• Paint or carpet edges show scratches and abrasion
• You’re performing an interior restoration or detailing refresh
• Moisture has caused rust or surface degradation around the sill area
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64455111KIT
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 / A / B / C 1950-65
Diagram ref no 55
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64455191500
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
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12 Month Warranty
Worldwide Delivery
Fits Left or Right side 
Fits:
Porsche 356 A / 356 B / 356 C
Click 'Zoom in' for large parts diagram.
Diagram ref no 24
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64455111700
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Threshold kit includes:
- 2 Wide aluminium strips (64455111700)
- 2 Threshold rubbers (64455111500 / 64455111600)
- 2 Narrow aluminium strips (64455111900 / 64455112000)
Fits:
Porsche 356 Speedster / Roadster 1950-1965
Click 'Zoom in' for large parts diagram.
Diagram ref no 24
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
SMC55111700
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
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12 Month Warranty
Worldwide Delivery
Fits Left or Right Side
Fits:
Porsche 356 A / 356 B / 356 C
Click 'Zoom in' for large parts diagram.
Diagram ref no 27
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64455111500
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 Speedster
Porsche 356B 1960-63
Porsche 356C 1964-65
Click 'Zoom in' for large parts diagram.
Diagram ref no 1.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG55901107
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356B 1959-63
- Porsche 356C 1963-65
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12 Month Warranty
Worldwide Delivery
The OE Match mounting strip is a U-shaped metal mounting channel designed for the door step threshold rubber seal on Porsche 356 models. This component sits beneath the rubber door threshold seal and helps hold it securely in place along the door opening.
Sold each, 2 required per car (one for each door)
Fits:
Porsche 356 - 1950 to 1955
Porsche 356A - 1955 to 1959
Porsche 356B - 1959 to 1963
Porsche 356C - 1963 to 1965
U-shaped, metal threshold rubber seal mounting strip finished in stove enamelled, gloss black
Diagram ref no 26
The mounting strip supports the door threshold rubber seal and ensures it stays firmly attached to the body.
By holding the seal securely, it helps prevent movement, protects the sill area and contributes to a clean and finished appearance of the door opening.
Replacing worn or corroded mounting strips restores the proper installation of the threshold rubber and helps maintain the integrity of the door sill trim.
Function
• Seal Retention: Holds the door threshold rubber seal securely in place
• Mounting Support: Provides a metal channel for attaching the rubber step seal
• Body Protection: Helps protect the door sill area from wear and moisture
• Restoration Fit: OE-style design ensures correct installation in classic Porsche 356 models
Threshold mounting strips are exposed to moisture, road dirt and decades of use. Over time they may corrode, bend or lose their ability to hold the rubber seal correctly. Replacing them ensures the door threshold rubber remains properly secured and helps preserve the original appearance and protection of the door sill area.
Consider replacing the mounting strip if you notice:
• Loose or poorly fitted door threshold rubber seal
• Corrosion or damage to the metal channel
• Missing or bent mounting strips
• During interior or body restoration of a Porsche 356
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64455191700
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Perfect for sealing weatherstripping to door, hood, and trunk panels.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
00004330532
The product you are viewing cross references to these numbers
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12 Month Warranty
Worldwide Delivery
Porsche Side Sill Seals | Design911 Rubber Weatherstrips for Body Protection & Durability
Side sill seals are essential for protecting your Porsche’s lower body panels from water, dirt, and debris. These precision-moulded rubber seals create a tight barrier along the sill and door threshold area, preventing moisture and corrosion from damaging the body structure. A proper seal also helps reduce wind noise and vibration, ensuring your Porsche remains solid, quiet, and structurally sound through every drive.
At Design911, we supply a premium range of side sill rubber seals and trim components designed for durability, flexibility, and perfect fitment. Manufactured from high-quality EPDM and UV-resistant rubber, our seals deliver long-term resistance to heat, ozone, and environmental wear. Ideal for restoration, repair, or performance detailing, these components preserve your Porsche’s bodywork integrity while enhancing comfort and refinement.
What Do Side Sill Seals Do?
Side sill seals protect the lower body sections of your Porsche, forming a secure barrier between the doors, sills, and underbody panels.
Core Functions:
• Prevent water, mud, and debris from entering the sill area or cabin.
• Reduce vibration and noise at higher speeds.
• Protect painted and structural surfaces from corrosion and impact wear.
• Maintain aerodynamic flow and visual alignment.
• Support door sealing for optimal cabin insulation.
Strong, well-fitted side sill seals ensure lasting protection for both the vehicle’s exterior finish and interior comfort.
Why Do Side Sill Seals Fail or Degrade?
Constant exposure to road spray, temperature extremes, and physical abrasion leads to gradual deterioration of sill seals over time.
Common Causes of Failure Include:
• UV and ozone damage causing hardening or cracking.
• Compression fatigue from door closing pressure.
• Accumulation of dirt or debris degrading rubber flexibility.
• Corrosion or misalignment along the sill edge.
• Age-related shrinkage or loss of sealing contact.
When side sill seals fail, water and dirt can collect inside the sill cavity — accelerating corrosion and reducing sound insulation and comfort.
Why Replace or Upgrade Your Porsche Side Sill Seals?
Replacing old or damaged sill seals restores protection and structural preservation. Upgraded rubber materials offer improved elasticity, UV resistance, and compression recovery for long-lasting sealing performance.
Key Benefits:
• Restores watertight and dustproof sealing around sills and doors.
• Prevents corrosion and moisture build-up in lower body panels.
• Reduces road noise and vibration for a smoother ride.
• Constructed from high-quality, weather-resistant rubber.
• Fits Porsche 911, 944, 968, Boxster, Cayman, and Panamera models.
• Ideal for restorations, performance detailing, or preventative maintenance.
Design911’s Porsche side sill seals are precision-engineered for perfect fitment and endurance — delivering reliable protection and premium refinement for every model.
Highlights
• Premium Porsche side sill rubber seals and trim
components.
• Designed for exact fitment and long service life.
• Resistant to UV, ozone, heat, and environmental wear.
• Protects against corrosion and noise intrusion.
• Compatible with both classic and modern Porsche models.
• Perfect for restoration, maintenance, or body protection upgrades.
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Sunday: Closed