SEI SE121 Complete Sterndrive for MerCruiser Bravo OneThe SEI SE121 Complete Sterndrive is an aftermarket replacement for MerCruiser Bravo One drives in applications up to 425 horsepower. It includes upper and lower units and is available in three gear ratios with your choice of side or dual water inlets. Select both configurations to match your existing drive and application.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.Features SEI SE121 aftermarket replacement for MerCruiser Bravo One sterndrives; Includes upper and lower units; Rated for applications up to 425 HP; Available gear ratios: 1.36:1, 1.50:1, and 1.65:1; Available with side water inlets or dual water inlets; Fitment and Option SelectionConfirm your existing drive's gear ratio and water inlet configuration before selecting your options. Verify compatibility using your engine and drive information before ordering.This sterndrive is not a replacement for Bravo X, XR, or XZ drives.Installation InformationPlan to purchase the installation kit and anode kit separately. Dual-water-inlet versions ship with the upper and lower units in separate boxes; hardware required to join the halves is not included.