I will also be installing a double din stereo in my '08 Caliber. It looks like you and I have the same factory stereo cutout. My solution was to pick up an '09 dash bezel that accomodates the Chrysler MyGig stereo as it has a double din opening.
You may see if an '09 Cruiser bezel will do the same for you. Unless of course you like your half-moon holes