Genuine OEM Volkswagen Adjusting Washer, part number WHT011435AK. This washer is used to provide precise adjustment for components within the differential assembly. It is positioned as item 10 in the diagram, typically located around the differential gears. The precise adjustment provided by this washer is critical for maintaining correct alignment and ensuring smooth operation of the drivetrain. Genuine OEM adjusting washers are manufactured to exact tolerances to ensure proper fit and function, preventing premature wear and ensuring the longevity of the differential components.