I guess I've lurked long enough. I'll agree with the other guys that replacement stock Motor Wheel Corporation wheels will be just about impossible to find. But I've missed why it is that you want to find replacements. Unless you've got a lot of structural rust or other damage, those wheels should be fine to use. Or, like Grigg said, unless you have a mix of rim designs that include some Firestone RH-5° "widow makers" that split at the middle of the wheel. Them you'd have to get rid of. If not, I'd sand blast, paint, and mount new rubber. If they are all the Goodyear LBW lock ring design they should be as serviceable as any today. This basic system is still being sold new today on demountable applications.
If you have severe damage, or have some Firestone RH-5°s, you could look at remounting your Motor Wheel centers in new lock ring outer rims. A company that has a good reputation on the other forums I hang around is American Wheel Specialist in Pasco, WA. The owner's name is Juan Murillo, and his son's name is Shaun. Nice guys to talk too, and they've kept their customers happy, at least the ones I've heard from. The fact that you live in the Southwest might mean that you'd have to get to them through their contract relationship with the Les Schwab Tire Company. Les Schwab dealers are all over the west, but you'll have to know if they serve your area. If not, American will work directly with you.
Another option is new wheels from places like Wheels Now or Century Wheel. Wheels Now is in Wisconsin and Century Wheel is all over. Accuride has told me that they are both approved Accuride distributors that can put your bolt pattern in new 22.5" tubeless rims. If you decided to go this route you'd have to accept that these modern tubeless 15° tires won't look the same as your old 5° tube types, and they also wouldn't match your old hand hole design. If any of that matters to you. Long winded, but I hope that helps some. Stu McMillan
