Many suppliers offer power brake booster/master cylinder "kits", an "all in one" kit that has all the parts needed to install power brakes.. I assume you're installing a brake booster where previously there was none.. Classic Industries offers this universal rod kit. I suspect it's not all you need as there is some additional linkage associated with making a conversion from non-power brakes..
https://www.classicindustries.com/pr...ts/154235.html
About 3 years ago, I converted the non-power brakes on my '71 to vacuum booster assisted power brakes. I used this unit from Summit Racing.. The kit included everything I needed to make the conversion..
https://www.summitracing.com/parts/sum-760197