yea it's tailgate, guy should look closer it's common sense if he knew anything about a truck. The front shorts go on the fender behind the tire, then the door, cab corner really little pieces for the corners, then front of bed in front of tires, then rear bed behind tires.
Only problem I see if do you have to bend the back corners yourself and hope it stays or do you reuse the stock corners on back of the bed? They had bolts or clips that hold them on and are metal and prebent to the contour of the back corner.