Newer 2 bolt aluminum master cylinder for BB A-body

I want to buy the aluminum 2 bolt later model master cylinder to use on my 440 dart, along with the offset adapter.. My car has MANUAL brakes and all the cars that used the newer 2 bolt master had power brakes, so the 2 bolt wont have the recess in it for the rubber oring that holds the pushrod in..? I know doctor diff has them made for manual brakes but does anyone know of one of the later model cars that used this MC AND had manual brakes and would have the recess for the rubber oring?
Next question..The lines that go to my original MC have flare fitting sizes of 9/16-18 and the other is 1/2-20..The newer 2 bolts MC ports are both 7/16-20..SO, how do i adapt my lines to the newer MC without cutting and flaring?