When you get through shelling out $158.00 for the switch you'll find that it fits the round hole in your dash by inserting it from behind the dash. It has a threaded end and you simply screw on the (not supplied) chrome bezel to secure it. One would think the bezel comes with the switch for that price but it does not look that way in the catalog. Shouldn't be hard to find one though. See the Moss catalog - Part # 635-770. You would then push on the knob, which is available - Part # 635-775. Pushing the knob activates the electric windshield washer. Good luck.