I just found this site in a magazine for custom radiators and they will anadize it any color you want. They are a local shop for me so I am taking my stock unit to them and make a bolt in unit to cool my BBC. I dont have any other information right now. I have to figure out how I am going to get my radiator out and to them from Afghanistan. As soon as I get prices I will post up.
I guess I should add the link
http://www.mark7radiators.com