Sierra 18-5983 AlternatorSierra replacement engine parts are engineered to meet or exceed OEM requirements. Amp Rating: 7SI/70; Mount Type: Hinge; Pulley Type: Single Groove; Fits: MCM 3.0L (s/n 0L382122 - 0M326292); Interchangeable with: Arco; 20810; Delco; 19020600; 19020604; Mallory; 9-19109; Mercruiser Stern Drive; 862030T;