Been getting a lot of requests from Specialized riders that have the integrated mounts for Garmins. The design does not allow for other interfaces, such as the Wahoo ELEMNT. You can't just build one that screws in either since the ELEMNT tabs are 90° offset from Garmins. So this might be a possible solution. It quarter-turn locks into an existing Garmin mount then provides a ELEMNT mount on top of it. It does raise the element 7 mm higher than a Garmin Edge would sit.

Wahoo ELEMNT _ Garmin Mount Adapter v2.jpg
Wahoo Adapter