Genuine OEM Audi Rear Door Triangle Window, part number 8K5845299FNVB. This glass panel is an integral part of the vehicle's rear door assembly, designed to provide additional visibility and complete the door's structure. It is specifically for the left side of the rear door. The window features a precise triangular shape and integrated rubber sealing. Using genuine OEM glass ensures proper fitment, optical clarity, and factory-level sealing against water and wind.