Genuine OEM Volkswagen Door Rear Retaining Rail, part number 1K5831299J. This essential component is designed to guide and support the movement of the door's internal mechanisms or panels. It is typically found within the rear door assembly, providing structural support and ensuring smooth operation. Constructed from durable metal, this rail measures approximately 0.7 meters in length and weighs 0.423 kg. Using a genuine OEM retaining rail ensures precise dimensions and material quality, critical for the long-term reliability and proper function of the door system.