The 73-76 brake pedal is a little different than the 67-72 pedal, the "arm" of the pedal has a 90* twist on it down by the pad and also has a different style rubber pad, the ribs run horizontally on them where as the 67-72 pads have the ribs running vertically. These are just cosmetic differences though, both styles will work in any 67-76 A body.
