The 4th Gen's headlights are a lot bigger, you would have to do some serious modding to get them to fit, and look good.

Looks like this guy has a 3rd Gen. bumper with Charger headlights.



I would like to see the finished product, but I can't find it.

 

In the picture the headlights looks like early 3rd gen style truck to me.

The picture with the green 2nd gen ram

 

Yeah the pic with the Green ram has 02-05 headlights.

 

Just looking at the picture it doesn't appear there was a ton of fab work to make them it, at least on the outside of the fender's.

Inside the engine bay may be a whole nother story.

 

Yeah, the 3rd Gen lights on a 2nd Gen probably wouldn't be too hard, but a 4th Gen would. Those headlights are a lot taller and larger than the 2nd or 3rd Gen's.