I found this store:
http://www.bodykits.net/wings-and-spoilers/porsche/boxster-986/152058/
they have the entire GT3 kit. But the wing looks a little weird. Maybe it is just the picture. The GT3 bumper and rocker seem to be ok.
I'm somewhat worried about the following statement though:
On average 85% of the Duraflex parts we sell fit with no problems. About 15% will require minor to major modifications. These parts do not come ready to paint. In fact, they have to fitted, primered and then painted.