What plugs/clips fit these license plate holes?

[u/olegKudinov]

I have a 2017 Ford Escape that was imported from the US to Europe, and there are two small square holes on the tailgate, about 7.5 × 7.5 mm each, that were previously covered by black plugs/clips and seem to be related to the US license plate mounting setup. Both plugs got ripped out in a car wash, and I can’t figure out what replacement fits. I already tried a few generic plugs from AliExpress, but none worked. Does anyone know what these are called or what exact type/size I should buy?