Looking for unubtanium part ideas

How about the tail light housing gaskets for the early "A" bodies. The black gasket from the housing to the body. DMT says they are not available any where. In my case for 1964, 65, 66 Valiant, and 64, 65, 66 Barracuda.
Mopar A Body 64 Valiant Taillight Gaskets See the note in the listing.