'71 / '72 tailight rubber

Anyone know where I can get replacement tailight rubber, for '71 and '72 taillights, that goes between the lens and the back plate, also the one that goes behind the back plate. What I have dry rotted, and shrunk. I've contacted a couple of people online that sell some seals, weatherstripping, but to no avail. Any help would be appreciated.
Thanks,
Bruce

Have you tried looking in Hemmings Motor News? They seem to have a lot of hard to find parts both by private owners, and from companies who specialize or carry hard to find parts like weatherstripping, gaskets, etc. I wonder if that is something that might have to be "custom made". I remember my father making his own gaskets back in the '70s for older cars that he owned. I'm sure if the material is available something could be made to work.