These M6 Domed nuts fit all 1200cc to 1600cc aircooled engines in all vintage VWs If your vehicle has standard nuts on the sump plate it will leak. These domed nuts seal against the copper washer and stop oil running down the sump stud thread and dripping onto your driveway. Sold as a set of 6 to fit one vehicle The sump strainer and gaskets are also available from the Wolfsburg Restos ebay shop.