Here is a picture where my seam is. The bottom left corner of the hole the slide goes in is where mine is cracked. About where the white sticker is in the picture. My dealer fixed it and it was about 5 inches long. After it was fixed and they moved it around it came back and is now only about 2 to 3 inches long.
2015 Sabre 36QBOK-7
2007 F-350 Diesel FX-4