Looking for the flexible reinforced rubber rectangular air duct that runs from a/c plenum to a/c vents on 67 / 68
Doesn’t look like it is reproduced either
There’s some fellers in Oregon that have a Cougar wrecking yard that sells used Cougar parts. West Coast something or other… 
Dang would never have thought of them
Leon, shoot me your addy, I can help you out…gratis!
Good Going 3!! 
That’s the only piece of my original system behind the dash that I re-used.
On it’s way, Leon!