I have a Mazda Miata and a Mazda RX-8 they both have a wing spoiler on them and the only rack that I found that would fit both of them was a Saris Bones 2 . It's a nice sturdy rack and has a lifetime warranty. It can be adjusted to fit about anything.
http://images.search.yahoo.com/search/images;_ylt=A0WTefgFX0FK7GQAb4uJzbkF?p=saris+bones+2&y=Search&fr=yfp-t-501&ei=utf-8&js=1&x=wrt
http://www.amazon.com/Saris-Bones-805-2-Bike-Trunk/dp/B000BT30RK
The local bike shop should carry them. That is how I found out it would fit, they let me try it.