Hey guys, this may be what your looking for. It says for the frame rail for the years we want but it doesn't say "exactly" the sizes. A phone call should be in order if needed.
The Filling Station
Brake Line Fitting LinkIt was a while ago and I am a little hazy but I believe I bought one of these junction blocks - same as Jim Carter MEE 247. The vendors list the application as "1951-55 (1st Series) Truck (EXCEPT 1/2 ton)". If I remember, that part has three 1/4" holes, but the stock junction block on the 52 had one 1/4 hole in the center, and two 3/16 holes on the sides.
Carolines truck: that is a great modification. What size is the line from the master to the front junction block? Then what size from junction to each front wheel?
Pancho: The fitting on the end of the master cylinder is available from the vendors: