Rotor 8M6001252 Fits Marinized General Motors V8 engines with Delco made High Energy (HEI) Ignition Systems (1998 and newer) except MPI engines with the ECM 555 connector system. See your owner's manual for replacement information and directions. The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine Original Equipment replacement engine parts, oils, and accessories, but also works to serve all Original Equipment brands in the marine and powersports industries. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance, protection and peace of mind.