Easiest thing to do is just call the dealer with your VIN# in hand. Then ask for the part numbers for whatever it is you need. Sometimes they don't like giving up the part numbers, but they can't refuse to give them to you. Just tell them you just bought the truck and you're gathering a list of part numbers and prices needed so you can make the necessary repairs and you'll call back in a couple days to place the order once you've got everything figured out.