Quicksilver - Complete Upper Driveshaft Housing Bravo One XR Series Corrosion-Resistant Alloy 865440H73. Overview. There is a special kind of confidence that comes from knowing the heart of your Bravo One XR sterndrive is built on a foundation you can trust. When you push the throttles forward and feel the stern lift, you are relying on components deep inside the drive - parts you rarely see, but depend on every time you run. This upper driveshaft housing is one of those pieces. Strong, quiet, a