what you want is something like this...
http://www.darksydetint.com/smokedlights.html
it's made with 17mil tinted vinyl, the extreme thickness of the vinyl makes it relatively easy to conform to a convex curve. and lucky for aleros, the curve is relatively minor. it won't fade, it looks great, and you can always revert back to stock if need be.
http://carcustomz.com/osc/1534-1634-...ets-p-496.html
its not like window tint at all... it uber thick and pliable... we print on the stuff at work. we print the dacls that are on the side of football helmets and stuff... it has to conform to the round shape and still be really tough...