This Barnett Scorpion Series clear derby cover is designed to fit OEM primary covers on 2007-16 Harley Davidson Big Twins and 2018 Fat Bob and features a quarter inch thick, clear polycarbonate window to your clutch! The scratch and discoloration resistant window is firmly secured and sealed with an o-ring gasket. The outer cover area is CNC machined from billet aluminum and then given a black powder coat finish. The derby cover gasket is also included. For the ultimate in looks AND performance, install a Barnett lock-up clutch with your new cover! Note: Does not fit 2015-16 models using "narrow" primary (use #343-30-44015).