I'm surprised parts stores don't have rebuilt power brake boosters for these.

[piper62j]

Just surfing around, I found that classic industries has power booster rebuild kits.. Check them out.. https://www.classicindustries.com/p...p.ds&msclkid=7f43dac9a4d41c90e7a2b9dae05e8771

 

[Stanglover]

Just surfing around, I found that classic industries has power booster rebuild kits.. Check them out.. https://www.classicindustries.com/p...p.ds&msclkid=7f43dac9a4d41c90e7a2b9dae05e8771

That's interesting, but ours are 11" boosters.