Modification of the Spayk's original design. The support that fits into the light's hollow is solid now. I have also modified the measurements slightly and simplified the design of the license plate.
To personalize it, you can go to: https://www.tinkercad.com/things/9tpG9k4lZRF-m365-plate-customization.
Note: I have added a two-piece version that adds a cover for the brake light. I recommend to glue the pieces together to increase resistance.