Premium Replacement Alternator with Single Groove Pulley - 12V, 55A Premium replacement alternator that will fit late model Mercruiser, 12 Volt, 55 Amp, Internal regulator. 2-inch mounting foot. Single groove pulley included. Features: * All alternators are engineered for performance and reliability * All alternators are engineered and manufactured with precision and quality * All alternators must meet or exceed OEM performance before being boxed Replaces: MARINE POWER Alternator 1210-000 MERCURY Alternator 12449 MERCURY Alternator 78403A1 MERCURY Alternator 78403A2 MERCURY Alternator 817119A1 MERCURY Alternator 817119A4 MERCURY Alternator 92497A3 MERCURY Alternator 98555 MERCURY Alternator 98555A1 SIERRA Alternator 18-5957 SIERRA Alternator 18-5966 *ARCO Assurance 12-month part and labor warranty protection