Garmin continues to produce nice devices for the community and 67 Designs has been allowing you to mount them in your vehicle for 3+ years.
If your Garmin device has a 17mm ball and socket arrangement directly or through an official Garmin accessory such as a suction cup, then you can use the 17mm-20mm adapter. This is true for Garmin Nuvi, InReach Mini and many devices.
If your device does not have a 17mm socket, but has a dedicated cradle with an AMPS plate hole pattern, the you can use the AMPS Plate mount or the Diamond Plate Alternative mount. This is true for Garmin InReach and more.
If you have questions at all go Garmin device mounting options, please email Customer Service.