This product has been discontinued by the manufacturer and has been superseded by Sierra 18-5967-1Sierra 18-5967 Mercruiser Alternator NLA. Superseded by 18-5967-1 Sierra replacement alternator for Mercruiser Stern Drives. Sierra alternators meet or exceed USCG safety requirements and are 100% load tested for assured reliability. Pulley Type: Serpentine; Amp Rating: 55; Fits 1996-1999 GM V-6 & V-8 (305 & 350 CID) Carb Engines; Interchangeable with: Arco; 60055; GLM; 11610; Mallory; 9-19102; Mercruiser Stern Drive; 807652T;