Dash Replacement

Personally, unless you know for a fact it's been damaged (doubt that it has), I wouldn't worry about it. There are a number of things that aren't symetrical in these cars by design.

The RMD won't sit perfectly flush in the opening anyway. There will be places where there is a bigger gap than others (the corners particularly), but once installed it won't be noticeable. You need to get your aftermarket dash before beating on the frame or you'll create a lot of unnecessary work for yourself.

And Redfish is right. Once the frame is out and the pad is off, it kind of turns into a wet noodle.