Floor mounted pedal box

[Alex Gibson]

Hi all, I am looking to fit a floor mounted pedal box to my race car project.
What size master cylinders should i get for the front, rear and clutch?
I will be running mini spares 4 pots, drums on the rear and a non verto clutch.
The kit is advertised with 3x master cylinders (.625,.7 and a .75)
Anyone fitted one or know the sizes please?
Cheers, Alex