You need to change quite a few things- front headlights, front bumper, rear bumper, taillights and several clips and such. I believe the front bumper needs a different bar too. Anyways the cost is fairly high, around 2k. You could sell your stock headlights for few hundred (there are always those returning to stock) and then use the money to buy the 04-05 headlights to save a bit.

You can still use your old projectors + HIDS but it's a pain to get them to fit in too. I believe the 04-05's have different ballasts but I could be wrong. All I know is that it's a bolt-on project with minor modifications.

Try buying some plastic cleaner, the same type used to buff out the plastic rear window. It should unhaze the front headlights.