you have to get the housings for both the headlights and the taillights, then fabricate them into the locations of your current head and tailights. This is not something you can pull off on your own unless you have some impressive autobody skills, and id imagine the cost would far out weigh the impressiveness
EDIT: youll also need to do some work with your fenders aswell
EDIT #2: If your looking to make your sig true, your taking a wrong turn