I bought the upgraded/updated lights from a Dodge dealer on EBay. I had my choice of amber lenses or clear. I like how the clears look on my truck, which is silver. The new style plastic nuts fit right into the holes already in the roof of your cab. No modifications are needed. I am anal, so I added a drop of silicone sealer to each nut when installed as well as each screw. I've done this before and found no real issues removing screws later for bulb replacement. If using amber lenses, I believe the bulb is #168, if you opt for clear lenses as I did, teh bulb number is 194A, the "A" is for amber. I think I picked up a;; five for around a buck at my local parts house. Look at my pics and you should be able to see the lights.