Sierra 18-5172 Ignition Coil for Johnson & Evinrude Outboard EnginesSierra replacement ignition coil for Johnson/Evinrude Outboards.Fits: (1973-1976) 25 HP; (1976) 35 HP; (1975-1979) 40 HP; (1983) 40 HP; Interchangeable with: GLM; 72030; Johnson/Evinrude Outboard; 0502881; 0581370; 0581786; Mallory; 9-23106;