54758-07
Fits '07-later FLSTC, FLSTN and '08-later FLSTF and FLSTFB models. Heritage, Fat Boy and Fat Boy Special (Europe/UK) models must also be equipped with Profile Low Rear Suspension Kit P/N 54651-05, 54652-05 or 54001-04A.

54596-94
Fits '89-'06 FLST, FLSTC, FLSTF and FLSTN Softail models. Must only be installed on vehicles equipped with Profile Low Rear Suspension P/N 54588-94, 54665-03, 54648-00A, 54651-05, 54652-05 or 54001-04A.

54621-05
Fits '00-later FXST, FXSTB and FXSTC models equipped with Profile Low Rear Suspension P/N 54648-00A, 54665-03, 54651-05, 54652-05 or Rear Lowering Kit P/N 54001-04A. Also fits '00-'05 FXDWG models equipped with Low Rear Shock Kit P/N 54594-03 or Premium Billet Profile Low Rear Suspension P/N 54592-03.