859399T16 Mariner GEAR HOUSING ASSEMBLY, Complete (4.75 Inch/120.65 mm Torpedo Diameter)

SEI MARINE PRODUCTS - SE218 1.75 Gear Ratio Counter Rotation 25" 13 Spline Driveshaft
Our SE218 Lower Unit is a counter rotation replacement for Mercury 3.0 Liter V6 Engines. || If you have an 8 Spline drive shaft you will need to buy the stub shaft unit and purchase an upper driveshaft from an OE dealer. || SE216 Lower Units are not designed to replace Sport Master, Torque Master, or other high performance gearcases. || To determine if you have a counter rotation unit on your twin engine boat, it is easiest to look at the props. If the props are identical orientation, then they are both standards. If the prop blades are opposite, then the port should be a counter rotatio || Replaces OE#: 859399T16.

SEI MARINE PRODUCTS - SE218 1.75 Gear Ratio Counter Rotation 30" 13 Spline Driveshaft
Our SE218 Lower Unit is a counter rotation replacement for Mercury 3.0 Liter V6 Engines. || If you have an 8 Spline drive shaft you will need to buy the stub shaft unit and purchase an upper driveshaft from an OE dealer. || SE216 Lower Units are not designed to replace Sport Master, Torque Master, or other high performance gearcases. || To determine if you have a counter rotation unit on your twin engine boat, it is easiest to look at the props. If the props are identical orientation, then they are both standards. If the prop blades are opposite, then the port should be a counter rotatio || Replaces OE#: 859399T16.