AC Delco R45S SPARK PLUG Patented, one-piece insulator design withstands temperature pressure and vibration. ACDelco Spark Plugs are used as Original Equipment on more vehicles than any other spark plug. ACDelco Automotive Spark Plugs fit most passenger cars, trucks, commercial, marine and sport vehicles as well as small engines. AC Delco - the Original Equipment part on Every GM Vehicle! Use Amazon&apos;&apos;s Part Finder (in the Automotive Store) to locate the exact part for your vehicle.