SEI Yamaha 90 V6 25" 1.86:1 Replacement Lower Unit - Counter RotationNote for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready when calling. SE418, 1.86:1, 25" Driveshaft; Counter Left Handed Rotation; 90 V6 Outboards; Includes Sterndrive Engineering's No Fault Warranty for 3 Years; Measuring Guide: Use 20" models when from the top of the driveshaft to the mounting surfaces measures 22"; Use 25" models when from the top of the driveshaft to the mounting surfaces measures 27"; 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.