Fixed Rear Screen Architecture and Rare Surrounding Mouldings
Replacing the back glass on this twin-turbo grand tourer involves dealing with a fixed steel aperture rather than a typical liftback hatch. Because the car uses a conventional boot lid tucked below the base of the rear window, the glass bonds directly into the structural C-pillars and roofline. The factory glass originally supplied by Soliver carries OEM part number 67780100, which shares its overall perimeter shape with the Assetto Corsa edition and the early naturally aspirated 4200 Coupé. The primary challenge on this coupe is safeguarding the exterior perimeter moulding.
The glass is framed from the outside by an outer window trim frame (part number 387700170) and joined with an individual gasket joint cover (part number 386100340). These trim pieces have been out of regular production for years and are notoriously brittle. If a technician attempts to pull the back glass with standard braided metal wire, the friction slices straight through the inner lip of the surround frame before the adhesive lets go. Preserving these exterior mouldings demands working from the inside out to release the screen without distorting the metal-backed rubber profile.
Integrated Antenna Circuitry, Heating Elements, and Alignment Spacers
The back glass doubles as the vehicle's primary radio receiver, with both the AM and FM antenna matrices printed directly into the upper glass grid alongside the defroster elements. Signal transmission relies on an inline positive rear window filter and antenna amplifier (Maserati part number 201458) mounted beneath the interior trim. When glass breakage occurs, these fine solder tabs and wiring terminals are prone to tearing off if the surrounding C-pillar leather and Alcantara trims are handled roughly during the swap.
I source aftermarket replacements from established manufacturers like Pilkington, FYG, PGW, and XYG to ensure the embedded grid resistance matches the factory Maserati defroster relay load. Setting the depth and height of the glass correctly against the steel aperture requires factory-dimensioned lower spacer blocks (part numbers 387700354 and 387700355) combined with bi-adhesive setting spacers (part number 387700356). Without these precise spacers, the glass will sink too deep into the channel, leaving an unsightly ledge against the C-pillar roof seam and breaking the flush line down to the trunk lid gap.
Post-Installation Inspection Checklist
Once the replacement screen is secured and cured in the rear aperture, inspect these specific fitment and operational areas before taking the car on the road:
- Outer trim frame (387700170) sits completely flat against the C-pillars without waviness or gaps along the roofline edge.
- Gasket joint cover (386100340) is securely seated at the trim seam without pinching.
- Clearance between the lower glass edge and the upper edge of the boot lid is even across the entire width of the car when the trunk is latched.
- Third high-mount brake light centered on the interior parcel shelf illuminates cleanly through the rear glass without reflecting back into the cabin.
- Radio reception on both AM and FM bands functions without heavy background static caused by an unseated glass amplifier connector.
- Rear demister switch activates the glass grid elements evenly without tripping the interior relay or blowing the fuse behind the rear seat trim.
- Leather or Alcantara trim on both C-pillars sits flush against the interior perimeter without gaps exposing the bare pinchweld.
