Sierra International 18-5172 Marine Ignition Coil for Johnson/Evinrude Outboard Motor Sierra Ignition Coil Meets or exceeds the original equipment quality Sierra part number: 18-5172 Interchangeable with the following: GLM 72030, Evinrude/Johnson 0581786, 0581370, 0502881, Mallory 9-23106 Fit specific, check part numbers to ensure proper fit