Genuine OEM Audi Rear Left Window Guide Rail, part number 8R0839067C. This essential component is responsible for guiding the window pane smoothly and precisely during its upward and downward movement. It is positioned within the rear left door assembly. Weighing 0.0865 kg, this rail is engineered for durability and low friction. Opting for a genuine OEM window guide rail ensures exact dimensions, material quality, and proper alignment, which is critical for preventing window binding, excessive wear, and maintaining quiet, reliable window operation.