Genuine OEM Volkswagen Adjusting Washer, part number WHT011435AR. This washer is crucial for providing precise adjustment for components within the differential assembly. It is located in the differential housing, specifically at position 10 in the diagram. The washer is made of metal and is designed to ensure correct alignment and operation of the differential gears. Genuine OEM washers are manufactured to exact tolerances to prevent premature wear and ensure smooth operation of the differential.