I got my rims on ebay from Eurotech luxury, here is a link to the page:
http://stores.shop.ebay.com/EuroTech-Luxury-Wheels_Porsche-Wheels_W0QQ_fsubZ122609018QQ_sidZ41652318QQ_trksid Zp4634Q2ec0Q2em322
These are not a direct fit without hub centric spacers on the rear wheels since these are much wider then factory, you must request the spacers when you purchase the wheels. They do have other direct fit wheels also.
John