The Ribsters Rocker Box Coverage of brands for Harley Davidson FX models from the year 1985 to 1994 is characterized by a ribbed design that is reminiscent of the Flathead cylinder heads from 1942. These high-quality covers are made from die-cast aluminum and have CNC over-laden sealing areas to ensure optimal fit. They replace the standard rocker boxes and give the motorcycle engine a strikingly changed look.