I installed front disc brakes on my 1967 Chevelle back in the late 70's. At the time you could get just about anything you wanted at the wrecking yard. I added Pontiac station wagon springs, Olds 442 rear sway bar and lower control arms, bigger front sway bar and the disc brakes. Aftermarket caliper brackets were the only thing I ordered new. Sorry it's been so many years I just don't remember what donor car gave up the brakes, but I'm sure they came off an A body car.