Dorman 419-602 Idler Pulley Steel construction for long-lasting durability against heat, shock and corrosion Replacement stops squeak, squeal or groaning noise associated with a worn Belt Tensioner Pulley Direct replacement for a proper fit every time Manufactured to strict engineering quality standards Original Equipment (OE) Number: 5L3Z8678BA, XW4Z8678CA, XW4Z8678DA, 10129569, 12555244, 12555245