Where can I find these little rubber rear louver bumpers?

Back when I had my '86, I put louvers on it and it had these little bumpers that looked just like this pic. You would stick the thin tab through the hole in the louver and pull it through until the big part seated against the metal & the triangle part popped through the hole. Then you'd trim the tab off. They were to act as a bumper between the louver & rear window glass. I need some of these for my current louvers as I don't like the set up it has now. I've Googled everything and can't find them.

Any help is appreciated.

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