Now There's a finer choice when it comes to premium plugs, Autolite^® XL Fine Wire Spark Plugs. Unison's Autolite XL plugs combine the same trusted performance of Autolite massive electrode spark plugs with the enhanced premium benefits of an iridium fine wire design. View the information provided below to learn more about key features, or click here to learn how you can purchase your set of Autolite Aviation Spark Plugs.