S&S Cycle metal Breather Gear Evo FXR Softail touring dyna Shovelhead 1979-98S&S Cycle metal Breather Gear Evo FXR Softail touring dyna Shovelhead 1979 98 v twin part # 12 9906 S&S steel cam chest breather valve is a machined breather valve and gear. Designed to replace stock steel or plastic units. Features stock duration with standard 1. 121" outer diameter, groove cut along bottom, and "T" shaped timing mark on gear. Order 8 piece thrust washer set separately. More Information FITS FXST 1984 1998 FX 1979 1984 FXR 1982 1994