ahh, your wing looks so nice/clean compared to what I've got. There was only one male stud left in my wing, everything else was hacked off and glued in. Several of the plastic grooves (just right of centre in your picture) that the male studs slide under are also destroyed or missing completely. If I can replace a few of those off another spoiler, I should be able to get some sort of stud/washer/bolt combo to work.
I also need to replace the oem foam seal, and paint it ... and get a new boot lid.
Does the top half of the wing not sit exactly flush with the bottom? Just noticing the lower right corner of the image. My wing is similar with a couple mm overhang.