I just did mine after tinting the taillights.
You need four bulbs for taillights and bake lights / blinkers. And two bulbs for the reverse lights. Lights are significantly brighter! I would take a photo for you but my wife isn't home so I can't show you the reverse or brake lights.
I bought mine off Amazon. Got the highest rated bulbs and they work flawlessly. You are gonna need four in line resistors though. One goes on each brake light, two on each side. Stops the hyperflash. Got those on Amazon also got like $7