Compatible models :

 18mm Universal :

 For Garmin Forerunner 265S

 For Garmin Forerunner 255S

 For Garmin Venu 3S
For Garmin Venu 2S
For Garmin Vivoactive 4S

 20MM Universal :
For Garmin Forerunner 245
For Garmin Forerunner 245M
For Garmin Forerunner 645
For Garmin Forerunner 158

 For Garmin Forerunner 165
For Garmin Forerunner 55
For Garmin Venu
For Garmin Venu SQ
For Garmin Venu SQ 2
For Garmin Vivoactive 3

 For Garmin Vivoactive 5
For Garmin Venu 2 Plus
For Garmin Vivoactive 5

 22MM Universal :

 For Garmin Forerunner 265

 For Garmin Forerunner 255
For Garmin Venu 2

 For Garmin Venu 3
For Garmin Vivoactive 4