Bracket on firewall

[Klattu1929]

Frame s/n is long gone to corrosion, that was a disappointment. I have been wondering if it is a feedthrough fitting for vacuum wiper line, but after looking at the S/B the vacumm line routes near the fuel line passenger side. Long story short, I'll leave it, add it to another "A" mystery. If it bothers me enough I'll weld it up. Thanx for the inputs and ideas, wish my car could talk!!