I've just checked the service book for my GTS and I have nothing detailing all the factory options I chose. I've seen other threads about VILs but they relate to 911s - should Caymans have them too?
Mine didn't have either. In my case I suspect it might be because the car was originally built with 20" wheels (the tyre pressure sticker on the door jam is the giveaway) but they got swapped for 19s somewhere along the line - it had 19s on when I bought it secondhand.