You must be careful doing this because you only have one chance to do it.
Im guessing its the CF spoiler you got right.??
What I did was bought a box of crayons. I cut the tips off of the crayons, and threaded them into the thread holes.
Then I took some wet clay, and put pankakes of clay on the remote area where the bolts would go. With the crayons in place I put the wing exactlty where I wanted it to go, and pushed down.
Once I took the wing off I had 1/2" bolt sized holes on the trunklid. So I took a sharpie, and colored in the holes on the trunklid. Then I took the clay off, and drilled my holes.
Now the outside bolts are a PITA because you cant catch a bolt, so I took the biggest drill bit I had, and drilled a 2 inch diamater hole under the trunklid so I could fit the bolt. I got some 2" long 1/2' bolts with some washers, and bolted it down.
BTW...Did you get the weather stripping too? The weather stipping is a must because you dont want to get water in there, or having it chattering around at high speeds. Good luck. I can show you some pics if interested.