Rarest MoPar I've ever seen

What can you tell us about the very interesting remote brake booster? In the U.S. those are called "generally" a hydro-vac unit, and were added to things like old Jeeps. That general type was used here on various types of trucks. I don't think I've ever seen one for a dual system

Couple of types of U.S. hydrovac units, Bendix