They used slider mounts. I have a pair of those mounts in my garage waiting to go back on the hot rod if it doesn't sell with the big brakes.

Rockauto.com lists 11.75" rotors for an 1981 Grand Fury. Most of them were the 10.8" rotors but some police package cars had the big ones.

Once again, never say never with Chrysler.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon