Sierra 18-6454 Mercury AlternatorSierra replacement engine parts are engineered to meet or exceed OEM requirements. Use this alternator with Mercury and Mercury Sport Jet engines. 5 S/I 50 amp; Spool mount; Fits 2.5L engines; Interchangeable with: Arco; 20840; Mallory; 9-19112; Mercury Marine; 834832; 857006T; 875285T1; 881248T; 889955A03; 8M0064021; Mercury Sport Jet; 875285T1; 881248T; 889955A03;