GoPro mount for this Garmin mount?

Yes, search garmin female to gopro.

e.g., bikeimport.ch/.../26301

Nope, that fits this mount, which I also have. Look at the picture again.

Garmin Universal Out-front Mount For Varia, 010-12384-00 (For Varia) www.amazon.com/.../ref=cm_sw_r_cp_api_i_PQ8FA3T2W1FJQ9JV43GN

Maybe this would work for you.  Might be more than you need to buy, but gives you and idea of what to look for:

Amazon.com: TUSITA Flush Out Front Mount and Insert Compatible with Garmin Edge GPS Bike Computer, XOSS G/G+, Varia UT800 - Cycling Handlebar 25.4mm 31.8mm Light Holder Camera Bracket- Extended Mount Accessories : Electronics

Thanks. I ordered a part that looks like one of the parts from that link. I definitely did not want to order the whole kit.

This is the official Garmin one. It's used for the UT800 light www.garmin.com/.../552900

Thanks you jgforrest