1、Fitment: Fit for Mercruiser outboard; Fit for Mercruiser Alpha Generation II Models. Original standard, the manufacturing in accordance with strict specifications 2、OEM Numbers: 807929A1, 821759A2 are the reference part numbers. Please double check the part number of your item to ensure perfect fit. 3、Tight Seal: The base can be tightly combined with the water pump to effectively prevent water leakage between the water pump and the outboard. 4、Exquisite Craftsmanship: Seal carrier base is made of rubber material, which has excellent wear resistance and can operate stably for a long time in harsh seawater environments. 5、Direct Installation: Strictly in accordance with the original specifications of the design and production, meet or exceed OEM standards, do not need complex tools and technology.