Those two junction blocks that JC has are for two different locations on a '46. One is to mount to each rear wheel cylinder and has one threaded port. The other one is a tee fitting with three theaded ports and is mounted on the rear end via a tab. It is held on with a clip. It connects the two hydraulic fittings that go to both rear wheel cylinders and also connects to the rear flex hose.
The two junction blocks I have previously described are totally different. JC only has those two that I described above in their catalog. Is there another supply source who would carry a larger selection of these brass junction blocks?