Since you're kind of mismatched there, I'd check the crank arm also and make sure you have a three speed/variable speed crank arm. It'd be a shame to get a good working switch and find out there's one more piece of the puzzle to solve and a two speed crank on a three speed motor can bind the linkage and overheat the motor. Just remember turning the switch off does not cut the power to the switch. As long as the key is in the "ON" or "ACCESSORY" position, the motor is being fed.
Source for switches? I ALWAYS use Jim at JSRestorations for any switches I'm in need of. He stands behind his product and they are completely restored, none of this clean it up and test it and call it restored switches out of Jim.
