26-88397A1 Upper Driveshaft Housing Gearbox Seal Kit for Mercruiser Quicksilver Alpha One Gen II 2 88397A1 18-2644 The 26-88397A1 Upper Driveshaft Housing Gearbox Seal Kit is designed for use with Mercruiser Alpha One Gen II stern drive motors.Constructed with XRmarine material, the seals offer temperature resistance up to 105℃, suitable for marine conditions.The kit is engineered to match the specifications, proper fit and function within the designated driveshaft housing.This seal kit serves as a direct replacement for OEM 26-88397A1 and equivalent to Sierra 18-2644.It includes all necessary components for installation, allowing for efficient servicing of the upper driveshaft area.Designed for compatibility with a range of Mercruiser Alpha One Gen II models, the kit supports in various marine environments.The seals are built to resist degradation from heat, pressure, and exposure to marine elements, contributing to sustained drivetrain performance.With precise dimensions and construction, the kit integrates into the existing gearbox assembly.This replacement solution supports long-term and consistent function of the stern drive system during regular use on the water.