Going to get this legal and safe on the road and use it for a bit to see what needs attention
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Old nut vs (shiny) new nut.
I believe old nut is original as all flare nuts across four 40 series Toyota´s I´ve worked on are identical. I haven´t been able to source nuts with such a long shoulder but I believe the short shoulder version will work. When fitted into wheel cylinder it goes in far enough to force the flared pipe tight to the back of it´s threaded hole, with about half a thread sticking out. The old nuts fit with about 2.5 threads exposed, which equates exactly to the difference in shoulder lengths.
I´ll run this past an experienced mechanic and test/inspect thoroughly before driving on the road.