I found the power set up at a junk yard. I was careful to grab everything and it all mounted to my 69 with no problem. They have worked great ever since.If you are working on a 67-72, I can tell you that all you have to do is unbolt the master from the firewall, move it forward far enough to mount the booster to the firewall and bolt the master to the booster. You will need the adjustable brake pedal pushrod and the master pushrod between the booster and master, which may need to be adjusted for travel, but it is that easy. I did it on my 70.