Performance Machine P00532916BM Direct Bolt-On Right Front Differential Bore 4 Piston Caliper Black Contrast Cut for most Big Twin 84-99 w/11.5" Disc RotorDifferential bore technology has been applied to these 4 piston calipers. Precision CNC machined from billet aluminum, making them the most powerful and stylish brakes available for new generation bikes. Our famous PM icon logo is machined on the caliper to let on lookers recognize you're stopping in style. Fitment 1986 99 FLST ALL MODELS INCLUDING FATBOY AND HERITAGE MODELS 1984 99 FXST ALL MODELS EXCEPT FXSTS 1984 99 FXR, FXD, FXWG ALL MODELS EXCEPT