I bought a brand new set of DNA wheels (front and rear) complete and assembled for $620 including shipping. These appear to be just as good as any other brand I've looked at. They don't require adapters for the brake rotors or sprocket. Rear wheel comes with sprocket bolts, nuts, and washers. I bought mine for my CRF450 / CR500 conversion. Don't know if they carry wheels for steel frame CR500s or not.
The guy I bought mine through:
http://www.thumpertalk.com/classifieds/ ... 319&cat=28
The company selling them:
http://mxwheels.net/index.html
DNA Wheels home page:
http://trydna.com/motox-atv.html
Addressing the survival of the legendary CR500!