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Rear ¼ Glass
By OE Match
- 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Related, superseded, cross reference or alternative numbers for comparison.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
Fits Left or Right side
Fits:
Porsche 356/356A 1950-59 COUPE
Porsche 356B/356C 1960-63 COUPE
Diagram ref no 20.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64454390100
The product you are viewing cross references to these numbers
OEMatch Rear ¼ Glass — Fit, Finish, Clarity
Rear quarter glass and the associated seals help keep the cabin dry, quiet and protected on Porsche models. Properly chosen panels and their seals preserve appearance, limit water ingress and reduce wind noise, supporting long-term body condition and occupant comfort.
Available Types- Fixed rear quarter glass panels for non-opening windows
- Opening rear quarter glass (vent or pop-out) with fitted seals where applicable
- Complete glass-and-seal replacement units for easier installation
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original rear quarter glass.
OE (Original Equipment) refers to parts matching original specifications for the rear quarter glass and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM rear quarter glass engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Rear quarter glass is the side window positioned behind the rear doors. Some are fixed while others open slightly for ventilation. Replacements are available as plain glass panels or as matched assemblies that include moulded seals or bonded edges to restore correct sealing, alignment and finish.
Benefits Include- Restores watertight and airtight sealing to protect the interior and trim
- Reduces wind noise and vibration for a quieter cabin
- Protects bodywork from moisture-related corrosion where water ingress can occur
- Maintains visual alignment and factory appearance around the window aperture
- Impact damage such as chips or cracks from road debris
- Seal degradation from sunlight, ozone and age leading to hardening or shrinkage
- Corrosion or distortion of surrounding frames affecting glass seating
- Poor prior repairs or incorrect installation that compromise sealing or alignment
Replacing a damaged or weathered rear quarter glass and its seals helps prevent water ingress, removes sources of wind noise and reduces the risk of corrosion around the window aperture. Choosing a panel or matched assembly specified for Porsche models supports correct fit, preserves finish and helps retain the vehicle’s condition over time.
Advantages- Parts selected for Porsche applications to match shape and mounting points
- Materials specified for UV resistance and long-term sealing performance
- Direct-fit alternatives made to original-spec dimensions and tolerances for consistent installation
Fitting can appear straightforward but may require specific procedures such as correct positioning, sealing detail and careful reassembly to avoid panel damage. If you lack the right tools or experience, or if the vehicle includes hidden fasteners or sensors, seek professional installation. Recheck fasteners and seal compression after initial use.
