Enhance the performance of your vehicle with the Autolite 847 Spark Plug. The spark plug has a thread diameter of 14mm, and a hex size of 21mm, making it a perfect fit for your custom cruiser, Electra, or LeSabre. The spark plug has a voltage of 12V and installation depth of 9.5mm, ensuring optimal functionality. The Autolite 847 Spark Plug is made of high-quality copper material, ensuring durability and longevity. It is compatible with various models, including those with interchange part numbers RJ12Y6, R45SX, AR82, and 5613564, as well as OE/OEM part number 5613882. Improve your vehicle's performance today with the Autolite 847 Spark Plug.