Which one to choose, indeed? I don't have a manual, so without a schematic or part number to go by, I guess I'd have to pull the board and remove one to see exactly what's needed. Here's an animated GIF that I made to show the switch in action.
Are all of these switches momentary contact? The mechanics of this one aren't clear to me. There must be a little spring or rubber somewhere to push it back out, but all of mine are completely loose. (To make that two-frame animation, I pulled it out and then pushed it in, where it remained.)
Phil Nelson