Tapered / conical 91-09 style. Fits S&S V-series (Evo); T-series (Twin Cam); 86-03 S&S XL engines and all S&S X-Wedge engines. Will also fit stock H-D applications. OEM replacement reference 65324-83. Note: The 84-90 /10-up style is preferred by many for better flow characteristics. Note: The 91-09 late style is a conical / tapered shaped gasket that was introduced by The Factory in 1991 and replaced; again; with the early style in 2010. Note that the early style will fit all models and is generally seen as the better gasket design.