The first one is based off the second one.. which explains the higher kick of the second one. The second one is the OEM performance spoiler, which is the one you should get. The third one will fit horribly and look bulky since it's not one piece like a CSL trunk.
#2 all the way!
BTW the 2nd picture is an actual picture of the OEM one. I highly doubt the replica you buy from e92-lighting will look exactly like that.