Becareful there is one type that was used that can't be turned down far enough to fit, can't remember right off the differences in them. Ask Indypacer (Sean) he might be able to remember the difference in them.
I'll look in to it... thanks for the warning.
As far as I can tell though, I should be ok with only the friction surface being removed (i.e. no turning down of the rotor hat diameter). I have yet to confirm the measurements, but it appears so far that the inner diameter of target rotor's hat is large enough to fit over the Fiero hat without modification.
I'd like to get my hands on a set of old rotors to mess with, so that I can have everything ready-to-attach when I unwrap the car in the spring.