Did some work on the F150, the old headlights were showing their age, I had some crazing that I was unable to polish out. I made some marks(duct tape) on the garage door to ensure proper alignment. Then proceeded to swap the headlights and side marker lights. I used gloves as to not leave oil on the bulbs and shorten the lifespan. The new lights look good..and due to duct tape, i was able to ensure proper alignment.