SEI Mercruiser Outboard 4.3L Repl Upper Unit 1.81Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready when calling. SE116, 1.81; Replacement Mercruiser Gen II Upper Unit. Item is subject to a 20% restocking fee (Boat Covers, Bimini Tops, Outdrives, Drop Ship Items and Special Order Parts)!**Year, Serial Number, and Horsepower are required to order. Please contact us with this information after you place your order otherwise processing will be delayed.