This lower unit gear box with a 15" short shaft and CD10 model is a perfect fit for your 1954 OMC Johnson Evinrude 5.5 hp outboard engine. It is designed for 2-stroke engines and is made in the United States. The box comes without a warranty, but it is a reliable product that will help you achieve a smooth and efficient performance for your boat. It is suitable for use in complete outboard lower units, outboard engines, and boat parts. This item is a must-have for anyone looking to enhance the performance of their boat's engine. Get your hands on this high-quality product today and experience the benefits of a reliable and efficient lower unit gear box.