Using mustang rotors for 4.5" bc

Countach711 said
So did you have the original rotors drilled also and just re-use them? Also, it looks like you used screw-in studs, correct? Sorry if these seem like stupid questions, but this seems like the absolute simplest solution to what is typically a somewhat expensive, involved process. What kind of racing do you do?

I picked these up from a buddy who went to drums. He is the real deal old guy drag racer. Very involved in the sport. I have no clue how it was done. I was at his place visiting, he showed me the car, and said for a song I could have the K/H setup. I sang. I can take a closer look at them.