After hours of searching archives on wheel threads, I've seen lots of people got their steel wheels from Summit or jegs. In most of the posts they are reffered to in the threads as having 3.5" back spacing and are the same as what others sell as Rockcrawlers, and they generally work ok after minor grinding on the calipers. I've looked at the catalogs and websites. They are only showing wheels with 3.75" backspacing. Are these what you ordered and are using?? IS US Wheel or Cragar the brand you got? 4Wheel Parts lists their steel rockcrawlers as having a 3.5" backspace. I guess I could play it safe and order theirs, but if I can save some $$ and get Summits, I'll do that. Parts #'s would be great. Thanks!