Genuine OEM Volkswagen Riveted Cap Nut, part number N91121501. This specialized fastener is designed to be riveted into place, providing a permanent and secure threaded anchor point for bolts in body and trim assemblies. It ensures a stable connection where traditional nuts are inaccessible. Genuine OEM hardware is critical for body applications, as these components are engineered with the correct material composition to resist corrosion and ensure a perfect fit within factory-drilled mounting holes.