The Garmin Forerunner Release Kit (for a bike mount) says it's compatible with the Forerunner 935 & Forerunner 945.
https://www.garmin.com/...7702/pn/010-11251-0S

Does anyone know if this can also be used with a Forerunner 955 or Forerunner 965?

I searched Google, Garmin and Slowtwitch but couldn't find the answer.