Mercury - Magnesium Anode Kit Alpha One Gen II Series Freshwater Protection 888755Q03. Overview. If you spend your weekends running calm freshwater rivers, easing into quiet coves, or making long, unhurried loops around the lake, you know how much trust goes into every part of your boat. Some components you check constantly; others you want to install once and forget about until the season changes. The Mercury Marine part number 888755Q03 Magnesium Anode Kit gives your Alpha One Gen II sterndriv