Clarifying the Rear Door Window Setup
If you are searching for a replacement vent window for this sedan, you will quickly run into catalog confusion because this specific door design does not have a separate rear quarter or vent glass. Unlike the later TF sedans that feature a distinct triangular pane, the MS platform doors utilize a single full-length roll-down glass. Where many vehicles place a small fixed triangular vent, this door utilizes a solid cosmetic rear door delta moulding exterior garnish alongside an inner delta cover.
When glass damage occurs on the rear doors of this car, the actual piece requiring replacement is the primary drop glass. Aftermarket parts catalogs designate this tempered pane under NAGS numbers FD21254 GTN for the left driver side and FD21253 GTN for the right passenger side (corresponding to factory reference 83410-38021 or 83411-38520 on the left, and 83421-38520 on the right). Because people often call asking for the small back corner glass after a break-in or trim separation, I always verify whether the issue is shattered door glass or damage to the adjacent plastic delta panel.
Verifying the Replacement Glass and Surrounding Hardware
Before installing the replacement pane, there are several distinct features to examine on the glass and the surrounding steel door frame. The factory side windows utilize an OEM green solar tint on tempered safety glass, so the new aftermarket pane must match this coloration rather than clear or heavily dark-smoked glass. There are no embedded electronics—you will find no defroster lines, radio antennas, or sensors mounted to this glass.
I also inspect the condition of the surrounding components on the door frame. The exterior delta garnish (original part 83830-3C000 / 83830-3C020 on the left or 83840-3C000 / 83840-3C020 on the right) sits tightly against the rear surround moulding assembly (82870-3C000 / 82880-3C000) and the outer beltline weatherstrip (83210-3C000 / 83220-3C000). I operate strictly as a mobile service, bringing the replacement glass and tools directly to your driveway or workplace parking spot anywhere across Toronto and the GTA. Having the correct hardware on hand ensures that if the mechanical retaining screws (part 12492-05123 or 12493-04129B) or mounting clips on the delta garnish are fatigued, everything goes back together without rattles.
Post-Replacement Inspection Checklist
Once the roll-down glass and the corner moulding trim pieces are fully seated, take a few minutes to walk around the vehicle and review the fit:
- Glass Tint Match: Look through the new rear glass alongside the front door window to confirm the subtle green solar tint matches across both door openings.
- Delta Garnish Seating: Check that the exterior triangular delta cover sits completely flush against the rear surround moulding without gaps where road grit could enter.
- Beltline Seal Compression: Ensure the lower outer beltline weatherstrip rests evenly against the base of the glass along the entire length of the door sill.
- Inner Trim Alignment: Verify that the interior delta garnish panel (83910-3C000 for left or 83920-3C000 for right) snaps tightly into the door card corner without movement.
- Track Alignment: Confirm the glass moves smoothly within the vertical rubber channels without binding near the rear edge where the glass travels past the delta garnish zone.
