Curious if there are any part numbers stamped on the rims? possibly near a valve stem?
I'm speculating they started out as these 6 lug Budd wheels (or narrower version) they are not that difficult to find. And they cut the center bolt pattern out and welded in a new plate and drilled the 10 on 7.25" pattern.
Grigg - I'm with you on that flat plate face. Same as the other person that had them done at Stockton. I'd guess the donor wheels are Accurides judging by the hand hole shape. They would have had the part number on the original face. Budds would have the number on the concave side along the drop center. Stu