There will be an issue w/ the mirrors - I think one has a square connector and the other has a circle connector. I'd suggest asking someone who has a similar truck to yours and finding out what they went with. It may be easier to run pre 2003 trailer mirrors because they don't have the light and aren't heated.
The brand new headlights will bolt up similarly and work in your current truck. You'll want to buy the upgraded harness as well. I used to have the part #'s but hopefully you'll be able to find them. I'd get the lights off ebay rather then the dealer and the harness off there too if you can find it.