Now There Is A Choice! Autolite^® Aviation Spark Plugs and Autolite XL Fine Wire Aviation Spark Plugs. Unison's massive electrode and fine wire spark plugs complete its existing piston ignition system, which includes Slick magnetos, Slick harnesses, SlickSTART^TM and LASAR^TM electronic ignition. Click through to learn more about Autolite Aviation Spark Plugs, its premium benefits and to spec your engine for Autolite Aviation Spark Plugs!