[Vehicle Fitment]: Compatible with Chrysler Chrysler 300 2005; Compatible with Dodge Durango 2004-2005, Magnum 2005, Ram 1500/Ram 2500/Ram 3500 2003-2005; Compatible with Jeep Grand Cherokee 2005---V8 5.7L. [Reference Number]: UF378, 56028394AD, 56028394AB, 56028394AC, 5306, LZTR4A-11. [Iridium spark plug]: Iridium is a type of refined alloy which is highly suitable to be used as the materials of the central electrode in a spark plug. It extends the life of the spark plug nearly threefold, ensures a more stable idle speed of the engine, and delivers a super performance to the engine with improved fuel efficiency, reduced emissions and faster starting up..
