Nick, I just changed mine, and I put the 1 prong ones in, and the truck did run like S@#T, so I changed them to the two prong ones, truck ran much smoother, I'd match what ever is in your truck.
Word to the wise, make sure you have a long extension when changing the plugs, and I'd change the wires at the same time. I used one of the old wires to pull the plugs out once I got it loose, and I also used the same wire to set the new plugs down in the holes. I cut the wire pretty short, and used it to set the plug in, and gave it a short turn, be sure not to cut the wire too short (the little metal connector will come out). Also, replace the tabs that come with the wires.
It took me a little time, never changed them myself, and the book wasn't really good with descriptions. Had them changed at 60,000, by the dealer and now I decided to save some money at 140,000. Good Luck