I have a brake/clutch pedal box from I believe a S/T or RSR...it requires two single circuit masters...there is a balance bar to control both...I have 79 Turbo brakes for Frt & Rr...all is going on a 68 SWB... I know I have to modify the body work in the foot well to accommodate the box... what I need to understand is what size single masters to use and where I might find them...any thoughts would be appreciated....