Spark Plug Wire Set (WR4113) by Motorcraft®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or even better than the part your vehicle was manufactured with. Motorcraft Spark Plug Wires are manufactured with premium-quality materials to strict Ford Engineering standards to help maintain AND control high voltage delivery to spark plugs.