[Mr70]

These were unique to 1970 Camaro/Firebirds w/Ft.Disc only,as 1971 & on saw many newly designed revisions.
1970 Left front #5470121.. beginning w/1971,#5472532.
1970 Right front #5470122..beginning w/1971,#5472533.
Bear in mind that these part #'s are NOT the same as the casting number actually cast into them.These are merely the shelf ID part numbers the GM placed on them in.
Someone who owns any one of these cars,could probably tell you the actual number cast into the caliper..