My a/c compressor seized up on me the other day and since I have no desire to fix it I decided to just bypass it. I called around to the parts stores in town for the bypass pulley and shorter belt but no one had the pulley in stock. Since i needed the truck to goto work that afternoon I measured the distance around the crank,water pump, power steering pump, alternator, and finally the tensioner pulley. With the tensioner backed all the way off it measured 83". I installed an 84" belt ( part number 840k6) and it works perfectly! Note: you have to remove the smootj idler pulley for this to work. Figured I'd try to save someone a couple of trips to the parts store.