Arrowhead Electrical Products Inc 12 Volt 63 Amp Marine Alternator Adr0120 12 Volt 63 Amp Marine Alternator For 10 SI Series Includes internal regulator External regulator used with older Prestolite units is not used with this replacement unit Replaces Prestolite ALK5206, ALK6207, ALK6210, ALK6210A, ALK6222, ALK6222A, ALK6222AY, ALK6222AYS, ALK6222Y OMC 381166, 381519, 383433, 383443, 384233, 981186, 981187, 985964