Sierra 18-6158A Alpha One Gen II Aluminum Anode Kit Sierra quality replacement anode kit for use with Mercruiser Alpha One Gen II drives. The anodes in this kit are constructed of aluminum and can be used in brackish, fresh, or salt water applications. Sierra aftermarket boat parts are manufactured to meet or exceed OEM requirements. For Alpha One Gen II 1991 Up Interchangeable with Mercruiser Stern Drive 888756A1 888756Q01 97-888756K01 97-888756Q03 California Residents WARNING Cancer and Repro