AirCooled Type 1 8mm Chromoly Head Stud Kit These are a Reproduction of The Original These will fit… All Type 1 Dual Port AirCooled Engines with 8mm Threads Includes all studs, correct nuts, and washers. Type 1 engines come with 8mm or 10mm studs Please check before you order.... These are 8mm Sale is for 1 8mm Head Stud Kit