Genuine OEM Volkswagen Door Window Guide Rail, part number 3AE839432D5AP. This component provides a precise channel for the window glass to slide smoothly and securely within the door assembly. It is positioned along the upper and rear edge of the door window frame. Made from durable materials and finished in black, this guide rail is designed for long-lasting performance. Using a genuine OEM guide rail ensures proper window operation, preventing binding or rattling, and maintaining the vehicle's original sealing integrity.