Genuine OEM Volkswagen Adjusting Washer, part number WHT011434AD. This washer is used to adjust and align components within the differential assembly. It is positioned as part 5 in the diagram, contributing to the precise setup of the gears. The washer is made of durable metal, designed to withstand operational forces. Genuine OEM parts are critical for differential components to ensure exact tolerances for smooth operation and longevity.