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 4777 features a 1.540" OD and a .640" ID that works well with our 26089, 955 and 943 dual valve springs. Category: Engine Components>Valve Springs, Retainers Core: N LTL: N MPN: 4777-16 Proposition 65: Y Special Order: Y