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you really will need the 23mm master, I was just reading Carrol Smiths book drive to win last night and the subject of brakes came up, he states that a brake pedal should have a little pedal movement as possible, and modulation of the brakes sould be based on pressure not movement. I cansee that he is correct, the more the pedal moves the harder it will be to modulate, a pedal that does not move but is pressure sensitive will allow better modulation. All fighter jet joy sticks are pressure sensitive not motion sensitive.
so the 19mm you have will give you a lot of pedal movement, it needs to travel further to fill the extra pistons than the 23mm.
if you can't find one, I have one from a 1988 930 I did not use because I have the earlier style chassis, and the master is under the footwell. Shipping to the UK will not be worth it unless you totally strike out.
Jim
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