Does anyone know where I can find new window regulator rollers for my 1989 Camaro ?

 

I'd be really surprised if anyone sold these separate from a regulator...more than likely, they are riveted on, or pressed on with a machine.

Your best bet is to find a good used regulator. Apparently they rarely go bad on our cars, so very few companies make them new, and they're quite expensive. If you don't have any used parts sources near you, find someone on here that's parting one out in the Parts Classifieds section, and just get the whole regulator assembly.