Hi I'm wondering if you could give any guidance regarding the size of master cylinder I require.

 On the front I have wilwood midilite calipers  (247mm setup).  On the rear I have a mk2 escort axle with drum brakes which have 17.8mm pistons.   The car doesn't have a servo.  


Space is limited so I need something nice compact.  The one cylinder will be used for the whole braking system. 

What bore size would you recommend?


Any help would be much appreciated.   


Kind regards


James