This is what I did to mount a clutch master cylinder in my cable clutch RHD mk1 Scirocco
I then mounted in the master cylinder and double checked the available travel, angles etc, and it was all looking good:
And following that, there was no excuse to not mounted in the car. Unfortunately, daylight had deserted me by this time, so the crapy pics are due to the inspection lamp.
It seems to fit a treat, I suspect that the heater pipe will need some modification, but I haven't checked yet, so I might be lucky. Full travel goes from pedal level with the brake pedal, to 1/2" off the carpet, so it looks like i measured right! This pic shows the pedal fully depressed: