COMP Cams Valve Springs, Retainers 4685-16 ID Spring Locator Set of 16 - 1.285" OD, .532" ID, .040" Thickness Made from hardened steel, these locators use an inboard locating shoulder to center the seat and hold the spring in place. The 4685 seat's 1.285" OD works well with our alve springs in ." guide applications. COMP Cams Spring Seat 1.285 X .532in X .040in (Set of 16)