Features a 10-tooth pinion gear and an 84-tooth starter ring gear that produces 15% more starting torque than stock gears. Gears are made of 8620 carbonized steel for strength and long life. Uses Factory clutch baskets. Made in the USA.1990-1993 fits H-D FLHS Electra Glide Sport 1990-1993 fits H-D FLHTC Electra Glide Classic 1990-1993 fits H-D FLHTCU Electra Glide Ultra Classic 1990 fits H-D FLST Heritage Softail 1990-1993 fits H-D FLSTC Heritage Softail Classic 1990-1993 fits H-D FLSTF Fat Boy 1993 fits H-D FLSTN Heritage Softail Nostalgia 1990-1991 fits H-D FLTC Tour Glide Classic 1990-1993 fits H-D FLTCU Tour Glide Ultra Classic 1992 fits H-D FXDB-D Dyna Glide Daytona 1991 fits H-D FXDB-S Dyna Glide Sturgis 1992 fits H-D FXDC Super Glide Custom 1993 fits H-D FXDL Dyna Low Rider 1993 fits H-D FXDWG Dyna Wide Glide 1990-1993 fits H-D FXLR Low Rider Custom 1990-1993 fits H-D FXR Super Glide II 1990-1992 fits H-D FXRS Low Glide 1990-1993 fits H-D FXRS-Conv Low Rider Sport Convertible 1990-1993 fits H-D FXRS-SP Low Rider Sport 1990-1992 fits H-D FXRT Sport Glide 1990 fits H-D FXST Softail Standard 1990-1993 fits H-D FXSTC Softail Custom 1990-1993 fits H-D FXSTS Springer Softail