MINI factory replacement fillister head screws M6X50-8.8-ZNS3 for mounting the side view mirror to the door. Sold in pairs - 2 screws required for each mirror.

2014-2021 F56 MINI Cooper and Cooper S Hardtop
2015-2021 F55 MINI Cooper and Cooper S Hardtop 4-Door
2016-2021 F57 MINI Cooper and Cooper S Convertible
2016-2021 F54 MINI Cooper and Cooper S Clubman
2017-2021 F60 MINI Cooper and Cooper S Countryman

To access the screws, twist the mirror base all the way to one direction to access one screw. Twist the mirror all the way to the other direction to access the other screw.