SEI SE216 Lower Unit 1.62:1 Alpha DriveshaftThe SEI 90-216-BS SE216 is an aftermarket replacement lower unit featuring a 1.62:1 gear ratio and Alpha driveshaft configuration. This version requires the appropriate Mercury upper adapter shaft to match your 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 1.62:1 gear ratio; Alpha driveshaft configuration; SEI part number: 90-216-BS; Upper Adapter Shaft RequirementThis unit requires the appropriate Mercury upper adapter shaft. You must have the correct adapter shaft in hand before ordering. Verify your existing gearcase number and shaft compatibility before purchase.OE Replacement ReferencesSEI lists this unit as replacing the following OE part numbers: 1623-822442A19; 1623-822442A20; 1623-822442A21; 1623-822442A22; 1623-822442A23; 1623-822442A24; 1623-822442A49; 1623-822442A50; 1623-822442T86; 1623-822442T87; Fitment and OrderingConfirm your engine application, serial number, existing lower unit part number, gear ratio, and adapter shaft compatibility before ordering. Matching the gear ratio alone does not confirm fitment.