So I was wandering what are the best after market head lights for my D. And how difficalt it is to change them.

 

I'd say to stick with the 2 piece style and not the 1 piece style. Get a set of clear corners and clear lenses like I have now. I had a pair of the 1 pieces before and they're harder to install and aim, plus in my opinion they don't look as "clean" as the 2 piece style.