what rotors fit?

The 11.75 rotors came on the B and R body cars. They fit perfectly on the A body spindles and Ma Mopar should've put them on there but she didn't. Same thing with the FMJ cars. It would've made sense to put the 11.75 rotors on those cars, especially the police package cars but the engineers just didn't think to do it for some reason. That is kind of a bummer because it really limits the number of 11.75 caliper adapters that a person can find in a wrecking yard.

In a wrecking yard about the only way you'll ever find the larger 11.75 setup is to look for a 1976 or newer Cordoba or similiar car. Late model B body cars or R body cars is it.