Genuine OEM Volkswagen locating bolt, part number N91185701. This specialized bolt is designed to precisely position and secure components within the belt drive and charging system. It is used to mount the idler pulley to the accessory bracket as shown in the technical diagram. The bolt features a precision-machined shoulder to ensure accurate alignment of rotating components. Genuine OEM fasteners are critical for maintaining the correct belt path and pulley alignment, which is essential for preventing premature wear of the drive belt and ensuring the longevity of the alternator and other driven accessories.