When trying to find replacement calipers for my 67, I can only find Kelsey Hayes 4 piston big block calipers online. My car has single piston calipers that I've already rebuilt. The car appears to have a drum brake master so I'm guessing the car originally had front drums and someone swapped disc's on at some point. Has anyone else seen this? Could they be from a front disc Fairlane? I'll get a picture of it sometime today... I wonder what it would take to install the 4 piston calipers.