General Purpose Heavy Duty Keyed Ignition Switch Alloy construction with waterproofing cover lucar connectors 3 position (off ignition/preheater starter motor) with spring-back from starter position Lucas 35670 128SA Durite 0-351-06 – universal fitment popular on many tractors and plant. 12 or 24 volt. Supplied with twin keys Diameter 54mm requires 21mm diameter panel hole length without key inserted 53mm length with key inserted 73mm