Approx 200% stronger than stock these chromoly head or case studs are for use on all 1300cc to 1600cc Twin Port aircooled engines with 10mm diameter studs. These studs are designed not to stretch or break under race conditions. Complete set of washers. Complete set of Nuts. Quantity: Full set for 1 engine. VW Beetle: 1960 – 1979. VW Splitscreen Van: 1960 – 1967. VW Baywindow Van: 1968 – 1979. VW Type 25 or T3: 1979 – 1983. VW Karmann Ghia: 1960 – 1974. VW Type 3: 1961 – 1973. VW Trekker: 1968 – 1983. VW Buggy + Baja: 1960 – 1979.