When I browse the 17" TRD Pro wheels pictured second, eBay and Slee's site both indicate that they are incompatable with 3rd Gen 4Runners. The only reason I could think of would be backspacing.
I wonder, though, if those vendors/sites only list them as incompatible because 3rd Gens never came with a 17"?
Does anyone know if these will bolt-up without mods/spacers?