They are actually anodised bronze from new but a freshly painted set would look almost as good. I have bin really lucky with my LMGT4 collection, I have a set of 17 x 8.5 and 9.5 that I paid £550 for because matey preferred his Rota's! And a pair of 18 x 8.5 that I paid £120 for because some idiot had painted them purple and then black, I just hit them with the work's steam cleaner set to 150 degrees C and now they are bronze again!
They are out there at prices cheaper than the copies that everyone pee's their pants over, you just have to keep your eye's peeled.