you can tell they are not.
the a, b and e body ones are actually too small.
they may bolt up(which I am not sure they do) but they don't fully cover the rotor.

The c-body ones do. Been a few years since I did the disc swap or even looked at the splash sheilds, but if you check a b body with the 11 inch rotors and splash sheilds, you will se about a half an inch of rotor sticking out past the shield.
A cbody doesn't do that.