Hi Dave,
I have exactly that one in your pic

But, its indeed connected to the rear and because the rear still doesn't brake enough, not much use of it. It just look slike it doesnt work in my car at the moment and I think I know wh now (see above).. I don't like installing these on the front as we already run without powerbrakes and it would just be a bandaid imo.
A dual master balancing bar would mean installing a complete pedal assembly and I have never seen one installed in a bug that I like.
It is sooo simple really: I just need to find a set-up that overbrakes the rear a little so I can adjust with the 7-step Tilton... How hard can it be right?...