Stoke

I need to find some of these plastic tabs. They slide into the rear window trim on my 1970 coupe and then the tab presses into the clips that are attached to the car. Most of the clips were dry rotted and they broke when the window trim was removed. I only have two that weren't broken and even those were dry rotted to the point that they almost broke. I can find the clips that attach to the car but I can't find these plastic tabs. Any help would be greatly appreciated.