Stock Bore : Timing pulleys,HTP & T/AT Timing pulleys Taper Bore:Timing pulleys,HTP Timing pulleys Stock Bore: Timing pulleys-XL,L.H.XH.XXH HTP Timing pulleys-3M,5M,8M,14,20M T/AT Timing pulleys-T2.5,T5,T10,T20; AT5,AT10Taper Bore: Timing pulleys--L,H,,XH HTP Timing pulleys--8M,14M Timimg Pulleys