brake line inside and outside diameter?

Could you not have used a inverted flare union?

I suppose I could have, but again a leakable joint in an awkward spot . By the time it occurred to me, I already had the steering box out and was in the process of rebuilding it. Turns out it was a good thing, because it was dangerously rogered- so bad that I ended up getting a junkyard box and rebuilding that one instead