carpet supports

The old carpet out of my Challenger has these plastic "carpet supports" glued to the carpet. They cover the seat belt anchor points on the outside of the front seats. I have attached pics of the one on the passenger side. The parts are very brittle, seeing as how they are 50 years old. I did a search of the interweb, and did not come up with anything. Does anyone know of a source for these?

Thanks for any help you can provide!!



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carpet supports