Complete 7-Piece 3/4" Bore Master Cylinder Rebuild Kit. Fits All FL & FX 4-Speed with hydraulic rear brakes (Except FXWG & FXSB), 1986-1999 FX/FL Softail, Late 1979-1984 FLH Electra Glide, 1980-1985 FLT Tour Glide, Late 1979-1983 FXEF Fat Bob & FXE Super Glide, Late 1979-1983 FXS Low Rider & FXB Sturgis, 1979-1981 XL Sportster (WITH Kelsey Hayes type aluminum Master Cylinder) Comes with Spring & Seat, Metal Plunger/Piston, Master Cylinder Cover Gasket, Cap, Rubber Seal & Retention Clip. Replaces HD# 42374-77B