I have a trunk lid, but it does not have the center crease. I was told (a) that it is not a 72 Demon lid, but a 71 or a 70-74 duster lid? (b) it is a 72 Demon lid as they did not put the crease on Demon lids (only duster). I am looking for the correct answer to this. I have looked at lots of 72 Demon pictures and have seen them both ways, so this is somewhat of a widespread differnce. If it should have a seam in the middle, which model year cars trunk lid will interchange? Do they all have the holes for the spoiler in the underside?