ARCO NEW Original Equipment Quality Replacement Outboard Starter Fits: Mercury, 65-85 HP 4-cyl, 10-tooth drive gear Replaces Part Numbers: Mercury 50-31976 Mercury 50-37274A4 Mercury 50-45822 Mercury 50-48643A1 Mercury 50-57867A1 Mercury 50-58788 Mercury 50-58788A3 Mercury 50-67341