Hello Kenneth,

I got a picture from the previous owner of the originally installed Brake Booster.
It is not the double hydrovac with two chambers.
It is, it looks like in the picture, the one with one vacuum chamber.
Maybe this will help.

Greetings Brian
Attachments
Brake Booster_Chevy C60.jpeg (94.12 KB, 113 downloads)


1970 Chevrolet C10 Stepside and 1966 Chevrolet C60 Firetruck (Germany)