Product Description Specifications Made from hardened steel, these locators use an inboard locating shoulder to center the seat and hold the spring in place. The 4770 features a 1.500" OD and a .585" ID that works well with our 985, 978, 924 and 939 dual valve springs. Category: Engine Components>Valve Springs, Retainers Core: N LTL: N MPN: 4770-16 Proposition 65: Y Special Order: Y