With the exception the banjo bolt is bored and and machined for a 1/4 inverted flare fitting.
Yes, but Evan said he was looking for the distribution block, not the bolt. The line coming off the master going to the LF brake is 3/16 as are the lines to the rear wheel cylinders.
The line coming from the back of the fitting in question, is 1/4” on a ‘52, and goes over to the passenger side to a distribution block. Front side on that distribution block. (now 3/16”) goes to the front passenger brake and the rear (also 3/16”) goes to both rear brakes.
It is the fitting that is held to the m-c with a hollow banjo bolt.
I suspect the part Evan is talking about, the difficulty in machining, would be the the hollow bolt with the inverted flare machined inside. The block would be easy to make. The bolt not so much!