These seat side panels come with a left and a right side and are 100% carbon fiber with 3D printed mounting areas. This is not an overlay on a factory part but a true carbon fiber part. The part is 4 layers of aero grade carbon fiber in 2x2 twill weave carbon made in the USA! The parts also have a UV protected clear gel coat and three coats of automotive PPG 2021 high solids clear. It is then hand sanded and buffed. Installs exactly like the factory part. The factory panel has a stupid little plastic cap on the bottom and we soon found out why it was there. The panel wasn't made long enough so there was a gap between this panel and the door sills. Instead of retooling one of the parts it looks like this little cap was make to take up the space. We lengthened this panel to the correct length so there is no more need for the little cap!