Bosch 4504 - Spark Plug - Part # 4504 New Bosch Spark Plugs in Bosch. Packaging. Please verify your year, make and model or contact us before pruchasing. Designed with high quality materials to meet or exceed OEM Specifications. Every single Spark Plug Set is 100 percent tested throughout the entire manufacturing process for worry free, out-of-the-box performance. Product is backed by a limited 1 Year Replacement Warranty.