This kit uses Truck/SUV (or LS3/L99 Camaro) crank pulley, Includes: bracket, idler pulley, tensioner, and mounting hardware, Can be used with standard (105amp) or high amp (145/160amp) LS style alternators. (will not fit Corvette/CTSV or 2010-15 Camaro large bolt pattern alternators), Designed to be paired with a 551779-3 A/C compressor and power steering pump bracket kit, Compatible with 965K6 belt when used with 551779-3 bracket kit.