c body rear disc brakes

I know this is kinda old already but... there were never factory disk brakes on the rear of any C-body. They are probably Imperial brakes, which are a totally different animal. The Imperials were largely 5X5 bolt pattern as well.

Got my first C-body in 1998 and haven't been without one since. I've owned 7 or 8 of 'em. :glasses2: