100% New Aftermarket Alternator Fits Cummins Mercruiser Inboard EI 165 4 Cyl., 169CI, 2.8L 2004-2005 Cummins Mercruiser Inboard EI 250 6 Cyl., 254CI, 4.2L 2004-2005 Cummins Mercruiser Inboard EI 300 6 Cyl., 254CI, 4.2L 2004-2005 Cummins Mercruiser Sterndrive ES 165 4 Cyl., 169CI, 2.8L 2004-2005 Cummins Mercruiser Sterndrive ES 250 6 Cyl., 254CI, 4.2L 2004-2005 Cummins Mercruiser Sterndrive ES 300 6 Cyl., 254CI, 4.2L 2004-2005 Lucas MARINE ALTERNATORS Various Models Various Engines Mando MARINE ALTERNATORS Various Models Various Engines Mercruiser HI-PERFORMANCE ENGINES Model 377 Scorpion (Gen+) (Ski) GM 6.2L - 377ci - 8cyl Mercruiser HI-PERFORMANCE ENGINES Model 377 Scorpion Sterndrive GM 6.2L - 377ci - 8cyl Mercruiser INBOARD ENGINES Model 350 Mag MPI (Gen +) GM 5.7L - 350ci - 8cyl -1998 Mercruiser INBOARD ENGINES Model 350 Mag MPI Horizon GM 5.7L - 350ci - 8cyl Mercruiser INBOARD ENGINES Model 350 Mag MPI MIE (Gen +) GM 5.7L - 350ci - 8cyl 1998-1999 Mercruiser INBOARD ENGINES Model 454 Mag MPI Horizon (Gen VI) GM 7.4L - 454ci - 8cyl Mercruiser INBOARD ENGINES Model 5.7L EFI (Gen +) MIE GM 5.7L - 350ci - 8cyl