Genuine OEM Volkswagen double collared stud, part number N91094101. This specialized threaded fastener features two distinct collars to provide precise alignment and secure mounting for components within the cooling system assembly. It is located at position 16 in the diagram. This stud is manufactured to exact dimensional tolerances to ensure proper fitment and load distribution. Genuine OEM studs are essential for maintaining correct component spacing and preventing vibration-related damage in engine-mounted systems.