Ricj,
There are at least 3 good sources. Vintage Wheels, Wheels Vintique and Wheels by Paulsen. I have shopped them all and they all offer pretty much the same products. Wheels by Paulsen has a bigger selection and they have been around for a long time. Also the price seems a little lower. You would have to compare to be sure. I just got a new catalog from Paulsen. Get yours by logging onto
www.petepaulsen.com and filling out the free catalog request.
They offer rally wheels in every size and bolt pattern you can think of. Even 6 lug for older Chevy trucks. They have them in raw steel, steel center/chrome rim, all chrome and powder coated. In addition to all of the stock sizes they have everything from 14" to 17" and widths out to 16" wide. They sell the stock '67 and '68 up caps as well as the police caps, moons, and a few old Chevy style that are made to fit the rallys, all in stainless.
15X6 in plain steel are $50. ea. They also offer custom backspacing so you can custom fit the widest possible wheel in the wheelwell.
Tom