Replacement nut holds your stock oil filler to the generator alternator stand. Requires a special tool for installation/removal. This is only needed if your installing the stock style oil filler. If your installing the oil filler extensions this isn't used. Sold Each Beetle Type 1: 61-79 Bus Type 2: 60-71 Ghia: 61-74Oil Filler Housing Nut Fits All Years Aircooled VW