for the 2007's stock 4x4 wheels with the factory 245/75/16 tires? I've heard both 5.5" and 4.5". Called the parts dept. they don't know. Called 2 tire wheel shops and they didn't have the info either.
Judging by a pic I saw with a known offset wheel mounted it would seem they are 4.5 but I just don't know.