Genuine OEM Volkswagen Backrest Frame, part number 5QM885503E. This is the primary structural component that forms the basis of the seat backrest. It is marked as number 1 in the diagram. The frame has dimensions of 0.725 m in length, 0.415 m in width, and 0.2 m in height, with a weight of 2.681 kg. Genuine OEM backrest frames are engineered for precise fitment, durability, and safety, ensuring the seat's structural integrity under various loads.