The head units that Crutchfield sells for our cars are Double DIN, but there is a * beside it. They go on to explain that the units fit our dash, but that some of the structural plastic behind the unit needs to be removed.
From Crutchfield, for the Kenwood DNX6960
Says "modified fit". (All the Double DIN say the same thing.)
Modified Fit - Requires Modification Installation Details for your 2009 Dodge Challenger Coupe » Because of the way your vehicle is wired at the factory, we recommend that you purchase a connection adapter to eliminate the need for extensive rewiring when you install your new stereo. PAC C2R-CHY4 $129.99 » To install this product, you’ll have to modify your vehicle. » Modifications to your vehicle's sub-dash are required. » The factory navigation system will be lost if radio is replaced. » You'll lose factory SIRIUS Satellite Radio capability if you replace the factory radio. » If your vehicle is equipped with a factory hands-free cell phone interface, it will be lost if the radio is replaced. »