Master cylinder?

JLP said
A 73 up master cylinder will work, it is odd that master cylnder is on there, it looks like the drum/drum type.

Yep strange setup, unless the previous owner has put the disc brake after having bought the car. It was equiped with the fixed caliper, when I got the car.

So this winter I will put a 74 (donor year) master cylinder for disc/drum (my setup) on the car. Do I need to change something else at the same time...I remember something about a rod, not sure what?