The SmartTrack Vertical Adjustment Kit (VAC) allows you to raise or lower the installation of the Toe Pilot Controls for better fit or comfort. It also makes it possible to use the existing holes in your kayak to mount your new SmartTrack system if the existing hole have non-standard spacing. Ideal to lowering for small feet, or raising for large feet. Each piece is 17.5 inches long by 3.5 inches wide. Easy to drill and cut. Comes with Two Panels with instructions and mounting hardware. Preview Instructions for VAC Kit with this link.