Mercedes R129 Seat Belt Outlet Cover| A1299100539 / A1299100639

This is a precision-engineered replacement kit for the seat belt outlet cover on the Mercedes-Benz R129 SL-Class. The factory seat belt outlet — OEM parts A1299100539 and A1299100639 — is a high-friction component that takes constant punishment from the seat belt webbing cycling through it daily. Factory units crack at the edges, scratch heavily, and eventually snap, leaving an unsightly broken trim piece at one of the most visible points in the R129 interior. We re-engineered this critical component to eliminate that failure permanently.

Replaces OEM A1299100539 and A1299100639 directly.

• ASA Construction: Moulded from engineering-grade ASA — inherently scratch-resistant and UV-stable. Unlike the factory material, ASA resists the continuous friction of seat belt webbing without developing the deep scratches and surface deterioration that make factory units look worn within a year.
• Exact OEM Geometry: Every mounting tab, belt channel dimension, and clip position is reverse-engineered from the original part. The guide installs in the factory location and routes the seat belt with the correct geometry and tension.
• 5-Year Warranty: We stand behind our quality. This product is backed by a 5-Year Warranty against manufacturing defects, warping, or material failure under normal use.

✅ AVAILABLE AS DRIVER'S SIDE (LEFT) OR PASSENGER'S SIDE (RIGHT): Order the side you need individually.