Mercury - Magnesium Anode Kit Bravo III Series Magnesium Protection 888760K02. Overview. When you spend your weekends on freshwater lakes, you learn to appreciate the small things that keep your boat running strong. The Mercury 888760K02 Magnesium Anode Kit is one of those parts you install once, and then feel quietly grateful for every time your Bravo III drive runs smooth and clean. There's a kind of comfort that comes from knowing your sterndrive is shielded from corrosion, especially when yo