i don't know who builds the rims.But I was looking on jimmy rivers web site and he does powder coating and probably does anodized.I was just searching some of the shops on bob's home page and saw he does powder coating.
Tru-Roll makes black anodized rims, as does Van K; both are catalogued by JC Speciality. If we're going to anodize, my preference would be for some color other than black (red wheels anyone, or blue?).