Want to replace my 05-1500 rear bumper with newer model that has cut outs for dual exhaust. Will it fit?

 

Nope. It wont fit properly

 

It's not a bolt on, however...I saw a lifted 06 yesterday out on the road that had a 4th gen bumper bolted to it. I wasn't sure at first but then there was a 4th gen with the same bumper in front of it for comparison. I don't know what work was done but it looked good.