Rick, not sure about a 63, but on a 64, the A/C cars have a different piece from memory.
A couple of years back, because i'm stupid, I cracked mine badly refitting it.
I had a local guy weld it for me. You need someone with VERY GOOD welding skills, special welding roads and mine was wrapped in a fire blanket to allow it to cool slowly.
After is was welded etc, it was dressed, looks fine, and has never leaked.
Rick, 63 to 65 are the same; 66 exc 75
I have a good piece for you, just send me an email with your zip code so I can get you a shipping quote.
Bugger, shows what I know.... LOL.
I wonder how I got that idea in my head? Rick, listen to Russ.