Product details:

Replaces stock tensioner, allows you to add more tension to the belt than the stock tensioner, & allows for greater range of belt length fitment. - Has a 1/2 drive hole in the rear of the front bracket to tighten belt. - OEM length belt can be used - Compatible with Corvette, CTSV,water pumps (any year)Compatible with Corvette (or CTSV/G8/SS) crank pulley (12560115)Made in Wichita, Kansas from aerospace grade, USA poroduced billet aluminum - Includes: belt tensioner w/ pulley and mounting hardware LS3 water pump (Camaro or Corvette) will require 551617x-1