Totally agree with ABSport!
I just followed the video with the letters.
Mine seemed to fit perfect as they're curved to the same profile as the top part.
I also agree with the comment that in the video, you can see gaps where the two panels meet where the lugs clip.
I had this when I fitted mine and wasn't happy with it.
I slacked off the screws and pushed the top panel and silver strip closer before re tightening.
Actually, all of the lugs apart from the ones either end can be given a modest push or tap and they do click in with no gap.

Gaz.