The Nissan part number is 46313-25661. The best I can tell from the parts manuals, these were used until the early to mid-'70s, possibly until the dual circuit master cylinder was phased in. Each Patrol would have four of these -- one at each front wheel, one where the flexible hose connects to the front axle, and one where the flexible hose connects to the rear axle. Note, there is another that looks similar but not the same -- it's the junction block that connects to the line from the master cylinder.
Pics are below.
Does anyone have two good junction blocks they would be willing to sell? Thanks!

