Hy dirtball, my research indicates the 1949 - 52 3/4 and one ton master cylinders are the same p/n, Raybestos p/n MC9221 1 1/4" bore with 1/2" X 20 t.p.i. port (1/4' inverted flare female). RockAuto has a manufacturer closeout at the moment $37.04 in Canadian dollars, hope that helps.
