Fits Evolution 1340 and Twin Cam-equipped models with stock air cleaner (except '08-later Dyna, FXS, FLS and FLSTSB). Timer Cover - Jeweled Skull. Links to the dark side. This mirror-chrome collection stands out in a crowd, with a contrasting 3-D chain that rims the surface and surrounds the distinctive raised Willie G Skull. Select from the traditional skull design, or for a little added flash, choose the version with the bright jewel-encrusted jaw line. Either way, this complete collection is a tribute to the mechanical side of your ride.