Sierra's 18-5418 Rotor fits GM 4 and 6-cylinder engines with Delco conventional ignitions. It is interchangeable with CDI E65-0003, Chris-Craft 16.69-00051, GLM 71020, Mallory 9-29202, Mercruiser Stern Drive 33659, 58217, 58217B, 58217Q, 898253008, 8M6001251, and OMC Stern Drive 380536, 384735. Each Sierra product meets or exceeds the original equipment part it replaces.