T56 Guys. Master Cylinder
 

I want to go with a Twin Disc clutch and the only problem in my way is the stock master cylinder. Since there isn't a straight solution for that. Does anyone know how I can choose a proper wilwood master cylinder since a lot with different bores and strokes are offered. All I know is that factory bore on the truck's master cylinder is 0.69mm. I do not know about clutch hydraulics and I would really appreciate all input.

Thanks