Best method is to go park in a AA or other auto store and start pulling them one by one then taking them in and matching them up. Does two things, keeps them straight so you don't just pull them all and go shotgun it and keeps you from buying ALL the sizes. I just did this on our 89YJ, I'm looking at 8 boxes or Thermoid tubing, two sizes not used, 6 sizes used. Also be prepared for the plastic T and Y connectors to break while you are taking the old lines off or putting the new ones on. Pick a parts store with a good variety of connectors and adapters before you start. When I did ours I wrote down what I *thought* we would need, had to make two additonal trips. Next time I PARK IN THE PARKING LOT....