The 55.1 master cylinder does not have an inverted flare hole in the end of it. It requires a special banjo fitting, consisting of bolt with an inverted flare in the head of it. This bolt passes through a brass block which provides for attachment of an additional brake line.
For some reason, this setup splits the front left wheel from the other 3 wheels at the master cylinder. Models prior to '51 did not. There was simply one single inverted flare on the end of the master cylinder which fed all four wheels.
Carl
