Help wanted!

I'm in a process of restoring a 1965 Dart w/power brakes. I need to get more info about the master cylinder!

Picture one is showing master cylinder from 1964 Dart w/power brakes, no bolt holding the piston in place and seven digit partnumber underneath.

Picture two is showing master cylinder from 1965 Dart w/o power brakes, bolts holding the piston in place and seven digit partnumber underneath.

Picture three is showing NOS master cylinder for 1965 Dodge Coronet w/power brakes. Bolts are holding the piston in place.

Now the question is;

What type of cylinder should I use? The diameter on the brake cylinders are the same, the pistons are the same. The only thing different is the rod. May that be the only difference in style?

Does someone knows of a NOS master cylinder with power brakes that is for sale?

Any help is more then welcome.