Genuine OEM Volkswagen Socket Head Bolt, part number N10423902. This bolt is designed for secure fastening within engine components, ensuring the integrity of the assembly. It is positioned as item 4 in the diagram. With dimensions of 66mm length, 13mm width, and 13mm height, this bolt is crucial for maintaining the precise fit and function of engine parts. Genuine OEM bolts provide the exact thread pitch and material strength required for reliable engine operation.