I may be wrong, but if I remember correctly Hillman Hunters had a factory remotely mounted booster.

When I got my coupe it had a booster mounted on the passenger strut tower (RHD). It was all a bit untidy so I ripped it out and binned it, my understanding is that if everything is correctly sized you don't need a booster anyway.

Out of interest is there any difference between the manual and auto brake components?