This set of Autolite 2543 spark plugs is ideal for Ford Escort and Mercury LN7 vehicles. Made of copper, these vintage spark plugs come in a standard configuration with a thread diameter of 14mm and a length of 18mm. The 16mm hex size fits perfectly with the ignition system, providing a reliable spark for gasoline-fueled engines with a 12V voltage requirement. The Autolite 2543 spark plugs have been proven to work with interchange part numbers AWSF24, AWSF24C, sr5, and RE10LC. These NOS spark plugs are manufactured in the United States and are perfect for anyone looking for a performance upgrade. Don't miss out on this rare find!