Brake MC sizes?

["Hugh Barber" <tr6nut@sbcglobal.net>]

Hi All,

I'm replacing the Brake Booster/Master Cylinder with dual master cylinders
on the TR6 vintage racer.  Does anyone have any suggestions as to which
sizes would be a good starting point?  I know that I could probably sit down
and figure out something close, but I figured if somebody might have already
done this, why reinvent the wheel?

Thanks,

Hugh Barber