I think a company called AIRTEX makes aftermarket replacement switches...just rebuilt the same switch off a '52 because the aftermarket ones I found don't have a map light position. Don't know how a '56 switch works but mine was in for off, 1/2 way out for parking lights, all the way out for headlights plus one click to the right for map light, next click was instrument lights, then keep turning right to dim the instrument lights.