Gasket search

I am looking (searching everywhere) for the rubber gasket that goes between the tail light assembly and the body on my 1964 Barracuda.
Any suggestions?

Think he means the hard rubber gasket that goes between the edge of the housing and the body. I'd like to be able to do those eventually but the 3D reverse engineering and tooling costs are prohibitive.

Eventually I hope I can get into the rubber and plastic parts.