WTB 63 polara AC firewall drain gasket

[fmahannah]

On my 63 Polara 500 down low on the firewall above the tranny is what looks like an ac drain line plus some other stuff. That hole is not sealed at all and I am getting a ton of hot air from the engine compartment blasting in there when moving probably because of the hood scoop.

Is there a gasket of some kind that is supposed to seal that area, and if so where might I find one?

Otherwise I will just have to improvise