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Rear license plate cover mounting question

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Try one of these. I bought the 2nd link for my plate. Got the 8mm. The cover that you have might need the 10mm.

Black License Plate Screws for BMW and Tesla, Phillips Machine Pan Head 18-8, Stainless Steel, M5-0.8 x 8 mm Bolt (Pack of 4) https://a.co/d/iswmSFw

ReplacementScrews Rear License Plate Screws Compatible with Tesla Model Y (My) - Stainless Steel - Black Oxide - Medium Length (Pack of 4) https://a.co/d/h2YKTOJ
 
The WeatherTech covered frames, and all their lic. plate holders, come with a handfull of screw types, some of them fit the Tesla threads. Also, you can get the same type of screws at almost any decent hardware store. Make sure you get the type that don't rust.