Slotted Castle Type Rear Axle Nut for 1963 to 1981 Harley Davidson and 1982 to 2000 Columbia Par Car +++ Pinon Nut for 1963 to 1993 Harley gas models and 1963 to 1965 electrics +++ Front Axle Nut for 1963 to 1969 Harley Davidson gas & electric three wheel carts +++ 1976 and newer E-Z-GO Rear Axle and Pinion Nut +++ Taylor-Dun Axle Nut +++ Also Melex, Pargo, Cushman and Jacobsen.