Master Cylinder Question

Sigh. First off I am not offended by anyone trying to help. Secondly, the studs you are showing in the first picture look suspiciously like the front of a power brake booster, not a firewall. The nut/washer/stud arrangement you are showing in the second picture are for the clutch bracket, not the brake bracket. And finally, in the last picture I can't see a fastener between the M/C and the brake bracket. There does seem to be an indication of studs between the M/C and the gasket but it's not clear. Two listings for an NOS M/C on the web showed M/C's with no studs. In my first post I said I had researched both the '67 FSM and the '67 parts book. So the last two pictures are nothing new.
I know how much of a pain in the a** is is to get up underneath the dashboard to see whats going on, been there a million times and had to be pulled out a few times. Please post up some photos of the MC and mounting location(s)when you get time. The bolt attached to the brake pedal bracket allows for one person to perform the swap from under the hood without having a 2nd person up under the dash to hold a wrench.
Cheers