I have one on my '05 GS. I'm sorry, I don't know if its a II or a III as I bought it 2nd hand.
It clips onto the front tank panel things though and as the later GSs are very different to ours I suspect that it won't work and will need some piddling around with to fit.
In fact, there was one for sale on here a year ago(ish) and I'm pretty sure it was an earlier model fairing that had been made to fit a later GS? Have a search in the Items for sale section and see if you can find it.
Andres