Do you have the nuts w/floating washers to go with the studs?
In the 2nd pic down, you are missing the LEFT guide/ push-pin with the foam washer that would slide into the "green" clip. [the original clip "head" is still there & needs replacing]
Top pic & 3rd pic down, the outer recessed holes should be a nut pressed in so you can thread a bolt thru each.
Hope this makes sense.....
If the LED 3rd brake light is cracked, its easier to replace it while the spoiler/wing is free than when its mounted on the trunk.