Hi Taffy,
Sorry for the slow response. I don't visit Reenlist as much as I used to. The wheels are Champion Motorsports RG5's and came off of a 04 996 GT3. They required large spacers to make them fit. They are advertised as being available in 993 fitments. I bought them used and got a great deal. Otherwise I would have gone with a wheel made specifically for a 993 C2S.
I love the way they look and they are very light. Classic design.
http://www.championmotorsport.com/product-p/cms-rg5.htm