Part Number: 7500-2 UOM: 1 - KIT Summary:Acorn style plug with oversize thread size and one tap for rethreading stripped 5/8" -18 timing plug holes. Fits all timing holes. This plug kit is for use to re-tap worn or stripped 5/8" -18 thread timing plug holes into 11/16" -16 thread timing plug holes for use of the oversized plug.Cases would have to be disassembled in order to use this kit. This will not ever allow the use of a stock plug. Fitment: EL 1936-1940 UL 1938-1948 FL 1941-1984 XL 1957-1985 FX 1971-1984 FXST 1984-1999 FLST 1986-1999 FXD 1991-1999 FLT 1979-1999 FXR 1982-1994 Country of Origin: USA