windwing installation

[gridleak]

I am about to install screw on windwings on my 29 coupe as in picture. I will verticaly center brackets on ridges around window but am unsure as to the front and back position as to how the wing should line up with the window opening, any suggestions?
Also what type of screws should be used, sheet metal or nut and bolt. is there wood behind the window frame?

Don

 

[denis4x4]

I too need some photos showing the installation of the Vintique wind wings