Harley Davidson Rocker Box Cover RSD Clarity allow the viewing of internals of the engine. Harley Davidson Twin Cam Rocker box covers by RSD Fits all Twin Cam models 1999 up. All hardware is included to fit. Made in USA. This was probably the most difficult Clarity item to design. Engine Clearance was a major issue as we wanted to ensure it worked with most engine internals and highlift cams, while still fitting the tight clearance of the stock HD frame. We accomplished all that while exposing the internals of the twin cam rocker box with a design that matches the rest of the Clarity line of products. Now you dont have to hide all those high-tech engine internals. The Clarity line also gives you a unique opportunity to customize the inside of your motor with watch like precision and detail. Features: Laser engraved RSD logo. Hardware included. Gaskets included. Sold as a pair. Made in USA. Fits all twin cam bikes 1999 up.