NOS lines are probably non-existent.
Your best bet is to have your's restored.
I had mine (70 Coronet) done by classic auto air

The compressor was also converted over to R-134a.
The dryer was replaced with an aftermarket.
and they added a thermostat to replace the old EPR valve in
the compressor...

They did an excellent job, but the cost with shipping
was right at $1000

Best of luck to you....