So I got one of those poly tanks, and it seems to be much more of a pain to install than I thought. Lots of the online info I have found is saying you "may" need to clearance some of the frame rails to make the filler neck fit. It seems the place on the tank where the fill nozzle is located is in the worst of all places to be. If I had a body lift, it might work ok, but I can't go any higher. I have included a picture of the issue. What did other people who did this swap do about this? Some articles say you have to transfer the old filler neck onto the new tank, but nobody actually says how to do this on a poly tank. I think I may go back and find a good used tank instead of hacking up the frame supports.