a few different companies make spacers for the wheels.
i think the backspacing is only off by like a inch but u would want something like these
eBay Motors: WHEELS SPACERS ADAPTERS 8 Lug Ford 1999-2003 F250-F350. (item 120179568834 end time Nov-10-07 13:32:26 PST)
have heard of anybody using them or used them my self but i think it will work!!