Someone else posted a picture of this switch mounted in the housing:
From here:
http://easternbeaver.com/Main/Elec__Products/Switches/switches.html (third switch down)
Says it fits right in the space you just have to find a piece of plastic to fill the rest of the slot. He has momentary and on/off switches.
I've purchased from Eastern Beaver before. Seems to be top quality stuff.
