1966 dart convertible

Help.
Slammed the door closed (not violently) but hard enough to close it with the window rolled up and the rubber stopper (???) or whatever it is called that sits in the vent window channel split. Apparently, due to age and being a little brittle coupled with the fact that the windows aren't adjusted as well as they should be. Any one have any idea if these are repopped anywhere???
Thanks