Mercruiser Alpha One Shift Cable Tool 91-12037 Go to amazon.com Related posts Expert choice for bellows adhesive FeatureThis shift cable tool is used to remove and install Alpha One shift cable jackets in the bell housing.It replaces OE # 91-12037. DescriptionThis shift cable tool is used to remove and install Alpha One shift cable jackets in the bell housing. It replaces OE # 91-12037.