caliper adapters

[my68barracuda]

are the 73-76 A body caliper adapters interchangeable with the F-J-M caliper adapters.
I know the adapets come in two sizes 3 1/4 and 3 5/8,

are the A's the smaller and the F-J-M the larger?

thanks

 

[DionR]

Don't think any of the FJM cars had the 11.75" rotors, so they would all be the small adapters and would be the same as the A-Body ones. You need to go to the later B and R bodies (I think) to get the bigger adapters. I seem to find them on the Cordoba's and such.

 

[my68barracuda]

thanks