I have a set of NEW Goodyear Gatorback belts that I bought for my Tahoe thinking I needed new ones. But I don't plus I don't feel like changing them out now that it is cool out. These are for the GMT900(nnbs) trucks and suv's. The part numbers are #4060935 for the main drive belt and #4040377 for the AC belt. I bought them from Rockauto for $50 shipped to me but will sell for $40 shipped plus paypal fees. These might fit some GMT800 trucks but not sure.