SEI SE205 Lower Unit for Mercury DFI Outboards 2.07:1 RatioThe SEI SE205 is an aftermarket replacement lower unit for compatible Mercury DFI (Direct Fuel Injection) outboards requiring a 2.07:1 gear ratio. Available for 20" and 25" shaft applications, these DFI-specific versions replace the OE lower-unit numbers listed below.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 Aftermarket replacement lower unit from SEI Marine; Designed for compatible Mercury DFI outboard applications; 2.07:1 gear ratio; Available for 20" and 25" shaft lengths; Shaft Length and Replacement References 20": SEI 90-205-A20D; replaces OE part number 1667-9011J33; 25": SEI 90-205-A25D; replaces OE part number 1667-9011J35; Fitment RequirementsVerify your engine serial number, DFI engine type, existing gear ratio, shaft-length designation, and OE lower-unit number before ordering. Horsepower alone does not establish compatibility.The SE205 requires a 4-1/4" gearcase bullet diameter and does not replace models with a plastic water pump housing. Applications with a 3-jaw lower unit require a change to the midsection shift shaft before an SE205 can be used.Select the DFI version for a confirmed DFI application. Carbureted two-stroke and four-stroke versions in the SE205 family must be matched separately.