You need:
https://buy.garmin.com/de-DE/DE/p/pn/010-13013-00
and
https://buy.garmin.com/en-US/US/p/523221#overvie
I bought the quick release mounting kit for the Fenix 3 (010-12168-11) and the Quickfit bike mount (010-13013-00).
I only need the bottom plate and the 2 arched bars and 2 screws from the F3 kit, the bike mount and my quick release strap from my 6xPS.
You can easily take it off your wrist and attach it to the handlebar within 2-3 seconds. Perhaps this is useful for someone. And you can’t forget/lose your quick fit wrist strap anymore, because it is still save on your wrist while biking.
Would be better and much cheaper, if Garmin had created only 1 kit for all.