I got a call tonight from the Discount Tire off the East-West Connector. The guy called to let me know my Kuhmo 225/50R15 tire had come in. I asked him if that was the tire I had picked up the other day?
Well, it seems they had ordered two tires. So, if anyone needs a new rear tire for their Spyder RT, Discount Tire has one.

770-434-0986 is their number.