Saleen Extreme Wheels
I was looking for a set of these also. checked with Saleen and no go. Spoke with Cruizin Concepts about their replicas and was told they are not available even though they were listed on their web site. Could only find some used ones here and there on EBay that would have required refurbishment.
Have you seen the 20" chrome wheels on the SMS (Steve Saleen Motorsports) cars. They are similar and you may be able to get a set of those.
Race Red 2014 GT500 Performance Pack & Track Pack