For 1998 Force 6.9hp and 15hp outboards with standard gear case. Also for1986 and newer Mercury and Mariner 6-9.9hp 2-cycle outboards. 1995 through 2004 F8 and F9.9 Mercury and Mariner 4-stroke outboards. 2001 and newer F13.5hp Mercury and Mariner outboards. 1998 through 2006 F15hp Mercury and Mariner outboards. Mercury XR10 plus 10hp Marathon, 10hp Seapro and 10hp Viking outboards.The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine Original Equipment replacement engine parts, oils, and accessories, but also works to serve all Original Equipment brands in the marine and powersports industries. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance, protection and peace of mind.