Ed strain website had info on boosters in the past.
I used to own a '42 G506 and I think Vov (Vehicles of victory) had some booster info too? Maybe all older than yours though.
Anyway, I meant it included the master cylinder, sorry.
Lots of good info on the web about retrofitting brake parts.
Hydroboost is very popular.
I think we all run into the parts availability issue, lol, you just don't see the broken down ones on the road. Hehe
Mike