These tail lights look great and are a plug and play application. The only difference in installing these vs. stock housing is the LED's have what I assume are load resistors. They are already wired into the LED housings but the resistors must be mounted behind the housings. (under the bed rail in the bedside panel) They easily fit behind the light but the area must be cleaned and prepped correctly in order to ensure the 3M foam tape will hold over time. As mentioned, no installation instructions but as long as you know how to remove the tail lights you should be able to figure it out from there. One housing didn't fit quite as snug as the other so I had to trim down one of the plastics prongs with a razor blade. Overall, lights look great and perform as they should (so far). I give it 4 stars simply because no installation instructions, one didn't fit as snug and required modification, and also requires stock bulb (which i had already upgraded to LED projector). Look really cool at night and makes the truck stand out from the rest!