SEI SE205 Mercury Four-Stroke BigFoot Lower Unit 2.33:1, 20" ShaftThe SEI SE205 is an aftermarket replacement lower unit for select Mercury four-stroke BigFoot outboards. Both versions feature a 2.33:1 gear ratio and a 20" driveshaft. Select the application that matches your engine and existing lower unit part number.This item is subject to a 20% restocking fee.Year, serial number, and horsepower are required to process your order. Please contact us with this information after placing your order. Processing will be delayed until this information is received.Available Applications 4060 HP Four-Stroke BigFoot 90-205-B20S: For select compatible applications replacing OEM 1667-9011G70.; 3050 HP Four-Stroke BigFoot 90-205-B20T: For select compatible applications replacing OEM 9011G86.; Fitment and OrderingThese lower units are intended for compatible four-stroke BigFoot gearcase applications. The horsepower ranges overlap, so horsepower, gear ratio, and shaft length alone do not identify the correct version. Verify your engine serial number and existing lower unit part number before ordering.