I found mine on e-bay, i waited till last minute and bid $50 and won them The guy said they had 2 snow tires on them, so 1 night i put them on the stang and burned them down at the car wash.
you don't see them for sale alot but then again who would want them?? the reason i run them is cause thats what is on my car and when i run at the track all they see is a stang with 4 turbines on it and never realize that the back 2 have soft compound tires on them. sorta like my version of a sleeper.
