https://www.bose.com/p/accessories/ub20-series-ii-wallceiling-bracket/CMSP-FUB20_WALL_CEIL-BRACKETKIT.html
UB-20 Wall or Ceiling Bracket for Cube Speaker | Bose
Unobtrusive wall mounting for Bose cube speakers. These brackets allow both horizontal and vertical adjustment of speakers.
ub 20ceiling bracketwallcubespeaker