I'll try to find a pic how an old member installed the wing. In the meantime here a sketch:
bracket shape like this
Bottom parts of bracket slides in between the hatch and glass, gets riveted to metal part of hatch
Wing sits on horizontal line and then gets riveted to the side of the upper part of the bracket
Its really "hovering" on top of the rear glass
W=wing ..... B=hatch door metal.... G=Glass .... Lines= custom bracket
I am interested to get one too. Contacted JSK in China ?? and got a quote. 460$ for shipping alone. With the wing it's too much of a project for now.
I would glue the wing to the glass with fast setting urethane and use rivets for the brackets.
I removed the attached brackets, they where too thin and didn't fit very well...
So i'm going to make my own brackets, stainless steel, with lasered STi logo.
The brackets will be bolted to the hatch door, and the wing is bolted to the brackets.
Looks good, and i can remove the wing easily.
I will upload some pictures when i got my brackets.