I opted for the 510's because they are 4" lights and fit well in the holes. The install is real easy, the most time consuming part is removing the headliner to drill the hole and run the wiring. I used a 90 degree weathertight connector and polyurethane sealant to keep the water out. The relays are all mounted down inside the dash below the pillar cover for easy access. Here are a few pictures.



