It's too bad they won't fit, since the price was so right on them, but at least you didn't get them swapped and discover they won't work after the fact.
Hoye's conversion kit is specially manufactured rims at whatever offset you tell them you want. That's why they are (relatively) expensive, though still very reasonable for what you're getting.
Measure the bolt pattern on your wheels from the center of one lug bolt to the center of the one opposite. There may be some pickup/SUV rims that will fit and work, if you can bring yourself to run that on your tractor.
Dodge Dakotas/Durangos, the Mitsubishi pickup clone, and a couple others (Maybe some Nissans?) have a 6 on 4.5 inch bolt pattern. Chevy'GMC and some Toyotas have 6 on 5.5 inch bolt circles. Incidentally, those match up pretty closely (And perhaps exactly, I haven't tried) with the smaller Yanmar and medium sized Yanmar bolt circles. Kubota may have the same bolt pattern for their wheels. At least some Mitsubishi tractors do not; it would be nice if we could start a database of bolt patterns on different machines to get a source to cross-reference what will swap with what.
