Rear license plate fastener/nut replacement?

The Prestige

The Professor
5+ Year Member
I bought a 97 HX coupe, and I noticed the dealer had used a power drill to add the temp tags to the car.

The right side bolt was loose a few days later and then I noticed it fell off today, so it's apparent that he stripped the threading.

I need to replace this ASAP, but what is this part called?

I tried searching for license plate fastener/nut, but I've gone blind on eBay searches showing nothing but license plate frames and the bolt itself.

Any input would be appreciated.

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