Genuine OEM Volkswagen Oval Hexagon Socket Head Bolt, part number N10664301. This bolt is used for fastening components in fuel, exhaust, and cooling systems. It is identified as item 10 in the diagram, securing part of the exhaust system. The bolt features an oval-shaped head and a hexagonal socket drive. Genuine OEM bolts are crucial for exhaust systems, as they are made from materials resistant to heat and corrosion, ensuring a leak-free and durable connection.