I am trying to find a couple replacement switches like the blue ones indicated in the photo. I have no idea where to find them, but thought I might see if anybody does.
Aircraft Engravers here is a popular for engraving Honeywell rocker switches. They also show square operators for the Honeywell AML51. Not sure if that helps.
Could it be the switch is mounted to a bracket behind the panel? There is a rivet down below. Maybe the hole was made too big so an alternate mounting method was used.
You need to pull the switch, or at least see all sides, and record any labeling and number of connections and connection type. Buy a switch like yours by viewing the cover only will likely give poor results. Good luck