This oil filler cap gasket is made of cork and is intended to only be used on stock Volkswagen (or OEM standard) oil filler caps. Cork gaskets are designed to swell from contact with oil, allowing the material to expand and create a good seal where the cap meets the oil filler neck.
37x58
Suitable for 1955-74 Beetle, 1955-71 Bus, 1962-73 Type 3, 1956-74 Ghia, 1973-74 Thing
Volkswagen Part Number 111115487