Mercury/Mercruiser Anodes. Application Gearcase Anode. Fits Mercury/Mariner 2.5/3/3.3 hp 2-cycle outboards (1990 and newer), F2.5/3.5 hp. FourStroke (MY 2006 and newer), and 6-40 hp 2-cycle outboards of Japanese origin (serial number 0N000001 & above). Priced individually, sold @ multiples of 2