Genuine OEM Volkswagen Shouldered Bolt, part number N91141601. This bolt features a precision-machined shoulder designed to provide accurate alignment and support for components in the underbody assembly. It ensures that parts are correctly positioned and held securely against vibration and road impact. Genuine OEM hardware is essential for these applications, as the specific shoulder dimensions and thread pitch are engineered to match the factory assembly tolerances, preventing movement and premature wear.