I got mine from a wheel place here in Southern Ca. I paid $75 a wheel for 15X8. I think they are from wheel vintiques. Not sure if they were powder coated, but the finnish was not that good, but I didn't care, as I was going to be painting them any way. I had the two I got from them and the two 14X7 that I had, powder coated silver, then I painted the centers with the Charcoal wheel paint from Classic.
I also got the trim rings from the wheel place for $20 ea. Not original, but works for me. I can get picks of them if you like.
I had to get the lug nuts and center caps from Classic.

I painted the center of one to see how the color looked. Here is how that one turned out.