GM G body 79 I am considering going to steel flex lines between master cylinder and frame mounted proportioning valve (GM OEM), less than 14” in length. Master cylinder (GM OEM for year) has ½-20 IFF female fitting & 9/16-18 IFF female fitting. I can locate 3 AN steel brake line to run between, but I am looking for the adapters. Has anyone done this conversion? I have seen a few photos from time to time of the conversion.