It would go into the slotted holes if I gave it a little push but the threads grabbed on the way in.  After opening them just a bit on the forward side it dropped right down with no pushing needed.  I am almost wondering if the holes are off a little on some.trunks. The doublesided tape gap looks like it could be because the spoiler is the slightest offset to the driver side on mine like 1 or 2 mm.  I fit it down a few times with just two studs. Then 4 making sure everything was lose, then marking for the outer studs.  I really didn't notice the slight offset but it's centered on the holes.  My one upgrade would be double sided tape with a plastic tear off that I could pull harder.   The paper kept ripping on me while I pulled. Anyway, it looks awesome and the tape gap.isnt the end of the world.