This is a bracket to be used on factory style truck waterpumps to allow easy mounting of an off the shelf HD tensioner. It was designed around the Gates/ACDELCO tensioner part number 38518 which you need to get on your own from summit/amazon/oriellys/ebay/etc. This purchase includes the bracket and the center grade 8 bolt, locking nylon nut, and 2 washers. This is made from 3/8″ steel, it is very strong and utilizes all 3 mounting points to the water pump. The 3 factory mounting bolts are reused.
There are several mounting positions which can be used for the tensioner tab to rotate the tensioner to whatever position works best for you. A spring-loaded automatic tensioner is preferred over a manual style tensioner whenever possible since it will accommodate natural belt stretch and is also easier on bearings when loaded.
This is especially useful for LSA swapped trucks that use the LSA supercharger on the factory 6 rib system. The typical pulley on the mentioned tensioner is 8 ribs, and that will work fine with the 6 rib belt and other pulleys. It is aligned such that the rear most rib matches the factory spacing leaving 2 ribs to the front of the belt, which is the same way 8 rib conversions add additional ribs. This is also recommended for high-rpm vehicles to keep the belt on if you experience that issue.
The redesigned version moves the mounting further out which puts the pulley in close to the factory position. I also doubled the number of clocking holes to have more options in rotating the tensioner to where you want it. A stock or close to stock belt length should work depending on your pulley combination.