What size are the steel tubes in the tunnel (‘73 Targa)

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I’m fixin’ to replace the lines in the tunnel on my ‘73 Targa. Unfortunately, there’s not enough room where they exit the tunnel to use Len Cummings’ poly lines.

I’m going to try to source lines in stainless. Does anybody know the sizes?

While we’re at it, is copper taboo? Sources for stainless?

Thanks for any information.

[Showdown]

No idea of the sizes but you can get everything at McMaster Carr or Belmetric.