Golf 1 cab

Hello guys

I am looking for som brake upgrade on my golf 1 cab, but i find something about brake servo and master cylinder. my golf is from 1993 convertible, does it have the old ones on or the bigger ones.

I found that the brake booster is 9" on a cabriolet, i have a number on it. But master cylinder , i can't found out which one is on. or maybe is 20.6 sitting on, probably its only master cylinder should be changed to 22.

Anybody……….