my radio is the same as yours and mine doesn't work, its because the original owner never chose it as an option when they bought the Nitro, you need a U-connect kit and programming to done to activate it, thats what i was told years ago,
They are straight vertically. Horizontally yes, they are curved. However they're a standard double din. A unit that sits flush on the side edges will be recessed on the top/bottom in the center. Some aftermarket units poke out a little anyways, so probably won't be a big issue.