Sierra 18-5772 Power Pack The Sierra 18-5772 Power Pack is interchangeable with the following: CDI 113-4041, Evinrude/Johnson 584041, Mallory 9-25017. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Power Pack Meets or exceeds the original equipment quality Sierra part number: 18-5772 Interchangeable with the following: CDI 113-4041, Evinrude/Johnson 584041, Mallory 9-25017