I've got a SCION xB that I'm going use a promotional vehicle and want to wrap it in full colour vinyl. However, I can't find a proper template to design these vinyls to scale. I've tried creating my own template but my measurements never seem to add up properly. Does anyone have access to the proper templates or know where to go to get them?

Preferably in Illustrator (.AI) or .EPS format.

many thanks!