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Rear ¼ Glass
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
The quarter window seal act as weather seals and vibration buffers for the rear side (quarter) windows. They prevent water, wind, and dust ingress around the moving glass edges while the vehicle is in motion and provide a secure, low-noise interface between the window glass and the body. Proper sealing also supports climate control efficiency and reduces road noise entering the cabin.
Fits:
Porsche 356 / 356A 1950 - 1959 COUPE
Porsche 356B / 356C 1960 - 1963 COUPE
Diagram ref no 15
• Application: Quarter window (side glass) seal on the left side (OE ref no 64454390300) and right side (OE ref no 64454390400) of the body. Designed to match original Porsche OEM specifications for correct fit and sealing performance.
Installed along the rear quarter window frame on each side of the coupe, these seals ensure the glass sits snugly against the body without gaps or excessive play. They help maintain the structural integrity of the window assembly and contribute to a quiet, sealed interior environment.
Original quarter window seals can harden, shrink, crack, or detach due to age, heat cycles, and exposure to environmental elements. When they fail:
• Water can seep into the cabin, leading to damp carpets and interior damage.
• Wind noise and buffeting can increase, especially at highway speeds.
• Road dust and exhaust fumes may enter the passenger compartment.
Replacing worn seals restores proper weather sealing, preserves original fit and finish, and helps protect the interior and bodywork of your classic Porsche.
Replace the quarter window seals if you notice:
• Water dripping into the cabin near the rear side windows
• Excessive wind or road noise at speed
• Visible cracks, shrinkage, or gaps in the existing seals
• Loose or detached sealing bead along the window edge
• During a full weatherseal or body restoration project
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64454390
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
The rear quarter window seal sits around the rear side window (quarter glass) opening, creating a weather-tight barrier between the glass and the vehicle body. Its role is to block water, wind, dust, and external noise from entering the cabin, helping preserve a dry, quiet, and comfortable interior.
Sold each. Fits Left or Right side.
Fits:
Porsche 356 Pré-A 1951 - 1955 Coupe * with chassis no from: F 10 531 >>
Porsche 356A 1955 - 1959 Coupe
Porsche 356B / 356C 1960-63 Coupe -REUTTER-
Diagram ref no 17
This seal provides a secure and flexible interface between the fixed rear quarter glass and the body panel. It supports the glass, cushions vibrations, and ensures a snug fit by preventing gaps that can lead to leaks or noise.
• Application: Rear quarter (D-window) weatherseal — fits around the quarter window frame on the coupe body. Can be used on either side as specified by fitment guide.
Over time, original quarter window seals can harden, shrink, crack, or deteriorate due to age, heat, UV exposure, and repeated vibration. When seals fail:
• Water can seep into the cabin during rain or car washes.
• Wind and road noise can increase at speed.
• Rust and interior damage may develop from moisture ingress.
Replacing worn seals restores the original weatherproofing and comfort levels, helping preserve the condition and value of your classic Porsche.
Replace the rear quarter window seal if you notice:
• Water entering around the rear window area
• Excessive wind noise or rattling while driving
• Hard, cracked, or visibly deformed seal material
• Loose fitment or gaps between glass and body
• During a comprehensive weatherseal refresh or restoration
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64454390500
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
The OE Match Rear Quarter Window Seal (1250mm) is a premium-quality replacement weather seal designed to provide a secure, weatherproof seal around the rear quarter window on compatible classic Porsche models. Manufactured to OE specifications for fit, profile and durability, this seal restores the original factory fit while protecting the vehicle interior from water, wind, dust and road contaminants.
Fits:
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Diagram Ref No 20
Manufactured from high-quality automotive-grade EPDM rubber, the seal offers excellent resistance to UV exposure, ozone, moisture and extreme temperature fluctuations. Supplied in the correct 1250mm length, it is precision-profiled to replicate the original factory design, ensuring excellent flexibility, long-lasting sealing performance and straightforward installation. It is an ideal replacement for aged, cracked or deteriorated original seals during restoration or routine maintenance.
What This Product Does:
- Creates a weatherproof seal around the rear quarter window.
- Prevents water, dust and road debris from entering the cabin.
- Reduces wind noise while driving.
- Helps secure the quarter window within the body aperture.
- Cushions the glass to reduce vibration and movement.
- Protects the window aperture against moisture-related corrosion.
- Restores the original fit and appearance of the rear quarter window.
- Forms an essential part of the vehicle's body sealing system.
Symptoms Of Wear Or Failure:
- Water leaks around the rear quarter window.
- Increased wind noise while driving.
- Cracked, split or hardened rubber.
- Shrinking or separation of the seal from the body.
- Visible gaps around the window.
- Moisture entering the cabin.
- Damp interior trim adjacent to the quarter window.
- Whistling noises at higher speeds.
- Perished rubber caused by age or UV exposure.
- Corrosion developing around the window frame.
Why Replacement Matters:
- The rear quarter window seal is continuously exposed to sunlight, rain, road salt and changing temperatures. Over time, the rubber loses its flexibility, becoming hard, brittle or cracked, reducing its ability to provide a reliable weatherproof seal.
- A deteriorated seal can allow water, dirt and wind to enter the vehicle, leading to increased cabin noise, interior water damage and corrosion around the window aperture. Moisture trapped around the window frame can eventually contribute to costly bodywork repairs, particularly on classic Porsche models.
- Replacing a worn rear quarter window seal restores the weatherproof integrity of the body, improves cabin refinement and protects both the glass and surrounding bodywork. The OE Match replacement provides factory-style fitment, premium EPDM rubber construction and long-lasting durability, helping preserve the originality, comfort and value of your classic Porsche.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64454390100
The product you are viewing cross references to these numbers
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
Porsche Rear Quarter Glass Seals | Design911 Rubber Weatherstrips for Precision Fit & Protection
Rear quarter glass seals are essential for maintaining your Porsche’s comfort, appearance, and weather protection. These precision-moulded rubber components provide a tight seal around the fixed or opening rear quarter windows, preventing water, dust, and wind intrusion. Proper sealing ensures a quiet cabin, prevents corrosion around window frames, and enhances the vehicle’s aerodynamic performance and aesthetic appeal.
At Design911, we supply a premium range of rear quarter glass seals designed for accurate fitment, durability, and flexibility. Manufactured from advanced EPDM and UV-resistant rubber compounds, our seals are built to withstand harsh weather, temperature fluctuations, and years of use. Ideal for restoration, replacement, or detailing projects, our seals help maintain the refinement, quality, and protection synonymous with Porsche design.
What Do Rear Quarter Glass Seals Do?
Rear quarter glass seals form a watertight and airtight barrier around the rear side windows, ensuring consistent protection and a premium driving experience.
Core Functions:
• Seal the rear quarter window against water and wind ingress.
• Reduce vibration, rattling, and external noise.
• Protect the bodywork and interior from moisture-related damage.
• Maintain aerodynamic flow and visual precision.
• Support structural integrity and correct window positioning.
A high-quality seal keeps your Porsche’s cabin dry, quiet, and comfortable while preserving the integrity of its bodywork and trim.
Why Do Rear Quarter Glass Seals Fail or Degrade?
Constant exposure to sunlight, temperature extremes, and movement causes rear quarter glass seals to wear and lose flexibility over time.
Common Causes of Failure Include:
• UV and ozone exposure leading to cracking or hardening.
• Age-related shrinkage reducing sealing contact.
• Contamination from road grime, cleaning chemicals, or salt.
• Compression fatigue from repeated vibration and door movement.
• Improper installation or body alignment causing distortion.
When these seals deteriorate, water leaks, wind noise, and corrosion can occur — compromising comfort and the car’s long-term condition.
Why Replace or Upgrade Your Porsche Rear Quarter Glass Seals?
Replacing worn or brittle seals restores perfect sealing performance, improving both comfort and vehicle protection. Modern rubber materials deliver enhanced UV resistance, flexibility, and durability for years of reliable service.
Key Benefits:
• Restores watertight and airtight sealing around quarter windows.
• Prevents water ingress and interior corrosion.
• Reduces wind noise and vibration for a quieter ride.
• Constructed from high-quality weather-resistant rubber compounds.
• Available for Porsche 911, 944, 968, and other models.
• Ideal for restorations, maintenance, or weatherproofing upgrades.
Design911’s Porsche rear quarter glass seals combine precise engineering with long-lasting resilience — ensuring your Porsche looks and performs as it should.
Highlights
• Premium Porsche rear quarter glass and window seals.
• Precision-moulded for exact fit and sealing performance.
• Resistant to UV, ozone, and temperature extremes.
• Improves noise insulation and protects against corrosion.
• Fits both classic and modern Porsche models.
• Perfect for restorations, detailing, and maintenance projects.
