My ignition switch fell apart , and i need to order a new one, but im having trouble finding a part no. If anyone could help I would be gratefull. The engine is a 1983 mercury black max 150 hp and the serial no is 6424308 it has the push to choke and 6 terminals on it. I didnt know if any of them will work as long as it has the 6 terminals and the push to choke ,or if it has to be a specific part no. Thanks in advance.