Sierra's 18-5186 Ignition Coil is designed for use with select Chrysler/Force and Mercury/Mariner outboard engines. Includes one ignition coil per package. It is interchangeable with Mallory 9-23200; Chrysler/Force/US Marine 339-7370A23 and F718475; Mercury Sport Jet 339-832757A4; Mercury Race Outboard 339-7370A13 and 339-832757A4; and Mercury Marine 338-4774A1, 338-4995A1, 338-4995A2, 339-7370A13, 339-7370A16, 339-7370A17, 339-7370A19, 339-7370A2, 339-7370A23, 339-7370A6, 339-7370A8, 339-7370B13, 339-832757A3, 339-832757A4, and 339-832757B4. Each Sierra product meets or exceeds the original equipment part it replaces. Fit specific, check part numbers to ensure proper fit.