Buttress Architecture and Factory Quarter Glass Hardware
Replacing the fixed rear quarter window on the 348 requires navigating the distinct flying-buttress profile that defines the side air intake design. The right-hand glass (factory reference 62093700) and left-hand unit (reference 62093800) sit recessed behind the B-pillar, secured deep inside the sail panel structure. Unlike contemporary sports cars that isolated the side windows with decorative bolt-on mouldings, this glass forms an unbroken visual transition directly into the engine cover louvers and the vertical rear cabin bulkhead.
The unit itself is entirely passive. It contains no embedded radio antenna wires, no defroster lines, and no alignment brackets. What makes it mechanically demanding is its relationship with the surrounding hardware. The glass sits immediately behind the frameless door drop glass, meeting the pillar box structure and anchoring near the internal vertical support rod (P/N 62080300 on the right side). Because original pieces were manufactured with the outer perimeter seal bonded directly to the glass edge, securing a clean seal against the body requires removing the interior leather quarter linings and cockpit bulkheads from inside the cabin rather than working strictly from the exterior.
Chassis Compatibility Across the 348 and F355 Range
Ferrari engineered these specific side glazing units to carry forward with minimal alteration between mid-engine iterations, though body style dictates whether side glass exists on the car at all. The closed Berlinetta (TB and later GTB) and targa-top models (TS and GTS) share identical quarter glass dimensions and profiles. When the factory developed the 348 Spider, the rear buttress was eliminated in favor of a flat rear deck and a folding canvas top with a flexible plastic screen, meaning the Spider variant uses no side quarter glass.
| Model Variant | Body Configuration | Glass Hardware Status |
|---|---|---|
| 348 TB / GTB | Fixed Berlinetta Coupe | Uses LH 62093800 & RH 62093700 bonded glass |
| 348 TS / GTS | Targa / Removable Roof | Uses LH 62093800 & RH 62093700 bonded glass |
| 348 Spider | Convertible Soft Top | No quarter glass (fabric rear screen assembly) |
| F355 Berlinetta / GTS | Coupe & Targa Successors | Interchangeable direct carry-over part numbers |
Because these cars are classic collector pieces kept in private garages, I operate entirely on a mobile basis, traveling directly to your home or office across Toronto and the GTA to service the glass without putting road miles on the vehicle.
Perimeter Gasket Aging and Delamination Issues
The original units installed at Maranello suffer from predictable long-term failures. Heat radiant from the longitudinal 3.4-litre V8 engine bay, combined with sun exposure along the C-pillar buttress, targets the bonded outer rubber trim. As these proprietary gaskets dry out, shrink, and split, they allow high-speed wind buffeting to develop directly behind the driver's ear. Water forced through the dried perimeter tracks inward along the vertical pillar box, threatening the interior trim panels.
Separately, the factory glass panels frequently develop milky edge delamination along the lower margins. Because conventional replacement channels omit these classic exotic profiles entirely from regular cataloguing, keeping this window sealed often means replacing deteriorated original units with aftermarket glass panes or custom Lexan reproductions constructed for competition use. Proper fitment demands aligning the new pane precisely flush with the painted exterior buttress edge, ensuring the frameless door seal can compress correctly against the forward edge without clipping the glass edge when the doors close.
