Carl I rebuilt the back brakes on my 72. There are 2 different wheel cylinders. The earlier one (roughly June 72 and before) only differs from the later one(after June 72) by the angle and position the brake line attaches to the back of the wheel cylinder. Otherwise the wheel cylinders are interchangable. I used wheel cylinders for a later model than my own. It was built May 72. I went to the neighbourhood(sorry Canadian spelling eh;)) auto supply and bought a couple of brake lines and bent them myself with a $10.00 line bender. Good luck. Casey