I used the Garmin heated in the Gretz mount - no problem!
Replaced the Gretz composite body with the Garmin about 3 years ago, assuming no changes since then....
Phil
KBTF
Salt Lake City
RV-10 built, flying
Murphy Moose, building
On my Glasair I left the Dynon AOA probe and it works well with my G3X.
On my RV-10 I installed the Gretz mast with a Garmin temp managed probe, also fits well.