For my ‘52, I bought artillery rims from wheel Smith, custom made to my specs and they fit over my CPP disc brakes. Mine are 6x15” 3-1/4” backspace. I also bought their hub caps and beauty rings. I love the look.
Thanks for the reply! The CPP is the same set that I have for my conversion. I have to admit the picture you posted looks better than their catalog picture. Did you choose the paint color? I would like the rims to match the color of my truck.