The Extension KIt for the FlatPanel Slider comes with all a four feet upper sliding track, a four feet long tractor track cable routing and a four feet flat wall protector for the sliding wheels at the bottum of the track. A complete set of mounting hardware is also included with kit.The Extension KIt for the FlatPanel Slider comes with all a four feet upper sliding track, a four feet long tractor track cable routing and a four feet flat wall protector for the sliding wheels at the bottum of the track. A complete set of mounting hardware is also included with kit.