The Shelby 1000's are either double spoked, or thinner than what is on that car.
The wheels actually come from the Super Snake (Wide Body is the Wounded Warriors):
EDIT: Tried finding a site that sells them, and looks like there isn't any. They are 20" Super Snake wheels (if you go to Shelby's site and click on 2013-2014 Super Snake, it shows right up). You can buy the crap out of the Alcoa style, just not that one.