i located the thread. M10 x 1.0 .
"The OEM fittings are M10 x 1.0. I think @nukegoat converted his entire system to 3an but I might be wrong."
2004 lx470 rear upper brake lines 3an inverted flare sizes for universal stainless lines - https://forum.ih8mud.com/threads/2004-lx470-rear-upper-brake-lines-3an-inverted-flare-sizes-for-universal-stainless-lines.1270774/#post-14187576
"The OEM fittings are M10 x 1.0. I think @nukegoat converted his entire system to 3an but I might be wrong."
2004 lx470 rear upper brake lines 3an inverted flare sizes for universal stainless lines - https://forum.ih8mud.com/threads/2004-lx470-rear-upper-brake-lines-3an-inverted-flare-sizes-for-universal-stainless-lines.1270774/#post-14187576