Abstract: A switch apparatus having a switch housing supporting conductive switch terminals within a switch housing interior. A switch actuator is supported by the switch housing for movement along a travel path to control an actuation state of the switch by selectively shorting the conductive switch terminals. A structure allows the switch housing to be mounted into one of two different thickness mounting panels. The structure includes first and second retainer posts coupled to the switch housing at separate spaced locations along a longitudinal axis of the switch housing. Flexible first leg pairs and second leg pairs extend laterally from the respective retainer posts. The legs can be flexed away from a first position and, after insertion into a panel opening, return to the first position.