Wow, glad you asked hadn't looked myself yet. They did a **** good job. All 4 holes are completely sealed. I asked them what they do to prevent corrosion. They said they shoot in a rust inhibitor first and then calk the whole thing. It already comes with a rubber gasket in place.
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WOW, They DID do a nice job! And those are not the bolts that came with the wing! The ones that came with it were way too short to put them there, and those heads are much bigger!
We drilled through the little lip on the edge as I was afraid I might hit the wires for the the trunk opener and sensor. I think I may coat the bolts with 3-4 coats of plasti-dip.