Fits 1999 and newer Mercury and Mariner 4 hp through 5 hp 2-cycle outboards; 1999 and newer Mercury and Mariner 4 hp through 6 hp 4-stroke outboards; 2005 and newer Mercury and Mariner 8 hp and 9.9 hp 4-stroke outboards plus 2008 and newer Mercury and Mariner 15 hp through 20 hp 4-stroke outboards.