I'm looking at a set of 20x8" wheels for my '02 Xterra. They are 6x5.5 bolt pattern with a 4.25" center bore diameter and a +12 offset. Would they fit or stick out?

According to my guide they should fit. The center bore is larger enough. These would sit about flush (within 1/4") with the fenders (wheels only). What size tire are you planning to run? Do you have any suspension modifications?