Product Description Specifications Made from hardened steel, this locator uses an inboard locating shoulder to center the seat and hold the spring in place. The 4640 seat's 1.600" OD works well with our 26055 Beehive spring. Category: Engine Components>Valve Springs, Retainers Core: N LTL: N MPN: 4640-1 Proposition 65: Y Special Order: Y