Try calling Winegardener Sales in Indiana. I have a Thor Gemini that I wanted a spare tire and wheel for. Checked with local salvage & repair shops, no luck. Ford wanted over $300 for a new wheel. After much looking, located a tire and wheel on eBay from them. The 195/75/16C tire and wheel had never been used and the wheel was compatible for the rear dual. Price was reasonable as well.
419-227-9047
http://stores.ebay.com/wine1wholesale
Good luck