Wanted rod wrapper parts (blank support wheels)

I want to build a power wrapper. Does anyone know where I can buy or scrounge wheels for the rod supports?

Thanks, John

Try here; http://www.smallparts.com/acetal-idl...qid=1299474203

Use an appropriately sized o-ring for the tire.

Found a better one. http://www.shopwiki.com/_Bearing-Mou...2010328&s=3885

any hardware store should have them, look at the wheels for window blinds, screen doors etc.

Mudhole has them, if it's the right thing.