Wow, that linkage vacuum booster setup is pretty unique. Even on this forum, I've never seen one before.. so you aren't going to have much luck, probably, finding something off the shelf. If you can find an old school NAPA that still has paper catalogs, you might get lucky on the master cylinder tho. The hard lines you can make yourself, the brake hoses can be sized up, or also custom made. Wheel cylinders you can probably find new or have sleeved with brass or stainless steel.
Leaving only the vacuum booster. Does it still work?
No It does not..
