EngValve Spring Seat, Locators 1.655" OD .570" .060 Thick, ID Spring Locator Set of 16 - 1.655" OD, .570" ID, .060" Thickness, None, Made from hardened steel, these locators use an inboard locating shoulder to center the seat and hold the spring in place. The 4860 features a 1.655" OD and a .570" ID., Engine Valve Spring Seat.