MINI factory original replacement Belt Tensioner for the serpentine belt.

Fits the following models:

2014-2022 F56 MINI Cooper and Cooper S Hardtop
2015-2022 F55 MINI Cooper and Cooper S Hardtop 4-Door
2016-2022 F57 MINI Cooper and Cooper S Convertible
2016-2022 F54 MINI Cooper and Cooper S Clubman
2017-2022 F60 MINI Cooper and Cooper S Countryman 

For the serpentine belt, see MINI Cooper Serpentine Belt OEM Gen3