twisted minis
+1y
Yes, you did get an answer. They said Geo Metro booster. You asked what year. Just find a Geo Metro. They didn't make them that long and they never changed.
Also here is another good thread about it.
You could also use an early Toyota booster and master cylinder from a 79-83 2WD truck. They are an 8" booster, and put out adequate power to stop a 3500 lb truck.