I, too, had bought a set of the reproduction rotors that Ed had a hand in getting made and put them away. I have the originals on my car still with 105K kilometers on it. I also remember when buying my 70 Gt500 in 1984 the previous owner told me how he had to press off the disk and replace it on one of the rotors on the car many years earlier in the early 70s. I thought he was crazy doing that not knowing about the boss rotors on later Shelbys. So I would guess you couldn't get replacement rotors back in the early to mid 70s. Kinda like trying to find a 69 Boss 302 quarter panel in 1972. Gary