all spoiles for the GS except the new SD, have the break light in the spoiler, so it is not after maket, although there are replicas of them, but cant tell between the two, the light in the window is std, in all gs, the spoiler is an option if the installer would have done it correctly, they would just undo, or not use the inside one, since there is one on the spoiler .
as far as the drilling goes, no drills for the WIN lip, but you would prob have to patch up the holes from the older spoiler, or you could just put plugs in there, if your color is black,
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