Here's a 71 with manual disc brakes....Again, a survivor, but I can't say if the MC is the original or not. Looks like the same MC the orange 71 Demon has with power discs. Notice the bail wire is reversed.
I have found that all 71-up drum brake master cylinders are like the first picture Scott posted, and all Cardone rebuilt master cylinders for ALL forms of brake systems on A-Body's revert to this type master cylinder with power, manual, drums, or discs.
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
