Hydraulic clutch, spec? Master cylinder and pipe size.

Hi,

I’m sure this has been covered before, but searched and couldn’t find anything specific. I’m definitely not the first or will be the last to install a hydraulic clutch, so need some advise from those with tried and tested setups.

What size master cylinder on pedal box? Research is showing most go for a 0.75 master cylinder? Is that correct?
To go with the master cylinder (assuming 0.75 master cylinder) what size pipe? Is 1/4” correct? I intend to use the standard vw mk2 golf slave cylinder at gearbox end.

is there any benefits in changing the mk2 golf slave cylinder (357721261A) to a mk4 golf version (1J0721261D)?

Thanks in advance.