911(964) 4 pot calipers, help needed

[bug-er]

Hello
I have amnaged to get my grubby little mits on a set of 92 porsche 911(964)carrera 4 brembo 4 pot calipers, does anyone know the piston sizes of these? thinking of using a porsche 944 turbo brake master cylinder.
I am currently using the 944 brake setup with the cast rear caliper mounts as I am using a swingaxle gearbox, is this off a standard or a turbo 944?
Up front I have the top hat style rotor and hub setup, and am using 944 S (87-89 model years) rotors, are these going to be ok?
Where can I get bleed nipple covers from as my calipers have none.
Any help appreciated