BMW Z3 Coupe Upper Frame Trim 8399678

This is a precision-engineered replacement for the upper frame trim on the BMW Z3 Coupé — OEM part 8399678. This piece is a discontinued factory component that fades, cracks, and separates from the rear quarter area over time. We reverse-engineered it to exact OEM dimensions so Z3 Coupé owners can restore their car's interior to factory-correct condition with a part that won't fail again.

✅ AVAILABLE IN LEFT & RIGHT: Both driver's side (Left) and passenger's side (Right) variants available individually. Order the side you need or both for a complete restoration.

The Engineering Edge

• ASA Construction: Moulded from engineering-grade ASA, this trim panel is UV-stable and heat-resistant — it maintains its finish and dimensional integrity in the high-temperature rear cabin environment where the factory part consistently fails.
• Exact OEM Profile: Every surface contour, clip position, and mounting geometry is reverse-engineered from the original part. The panel installs and fits identically to the factory piece with no gapping, warping, or misalignment.
• Discontinued Part Solution: OEM supply is exhausted and used examples are in the same degraded state as the part you're replacing. This is the only new-manufacture option available for this position on the Z3 Coupé.