Garmin makes a combo mount for VIRB (lights, camera, etc) that uses standard go pro mounts. It includes a twist on/off quick connect to attach to the bottom of the mounting bracket.
Garmin VIRB Ultra Cycling Combo Mount https://www.amazon.com/..._api_i_T6SBCbE6T1CM4
Edit: just realized you asked about mounting to the aero bars. The Garmin mount is too long to attach to an extension and still be centered.
Garmin VIRB Ultra Cycling Combo Mount https://www.amazon.com/..._api_i_T6SBCbE6T1CM4
Edit: just realized you asked about mounting to the aero bars. The Garmin mount is too long to attach to an extension and still be centered.