Genuine OEM Volkswagen Rivetted Cap Nut, part number WHT008305. This nut is designed to be riveted into a panel, providing a threaded hole for a bolt to fasten into. It is indicated at location 13 on the diagram. The cap nut has a length of 20mm and a width of 15mm. Genuine OEM riveted cap nuts are manufactured with precise dimensions and material strength to ensure a secure and lasting fastening point.