How far up does the rust go? Can you get a picture posted? You could always just cut a nice parallel al the way back, on both sides. When I had my back bumper off, most everyone that saw it(except the police, who started loking at bumper laws), thought it looked mean, and with the 33s, it would look totally bad- <img src="/forums/images/graemlins/butwiggle.gif" alt="" />. I might be able to post a pick in a few days or so, without the bumper, because thisd leaves the sorta gap you would have when cutting., then, rhino-line, herculine, something like that, to finish it, and prevent rust...

HTH
Chase

P.S. I have 33s and a 3 inch, and I had to cut just to turn the wheels..