Dude These are GM part numbers for the original parts replacement. The G8 has an inherent problem with throwing the A/C belt. They made an kit to shorten the belt length with new brackets and tensioner that supposedly gets rid of the problem for good. It's a real knuckle buster, little clearance to install. I was asking for the kit number for this. Three chewed up belts and one new tensioner and yet the same problem, it throws the A/C belt? Can anyone help with this please? It has been discussed in the past and the part number was thrown out there before.