This ACDelco Advantage disc brake rotor is a great replacement part for your Expedition or Navigator. Measuring at 13.5 inches in length and with a rotor outside diameter of 13.5 inches, this rotor has a vented style and an uncoated finish. It has a bolt pattern of 6 x 135 mm and is suitable for rear placement on the left or right side of your vehicle. The rotor is made of cast iron material and has a thickness of 21.99 mm with a discard thickness of 19.9 mm. It is a new old stock (NOS) item with a manufacturer part number of 18A2460A and an interchange part number of 88878477. This product is not a vintage part and is manufactured in China with no universal fitment.