They make them model-specific for the instructions. Some cars are bigger/have different sized headlights. The kits are really universal, but the wire lengths may be slightly different.
I bought a kit for the Skyline from ToyEast. It's about $13 shipped (best to order several things at once), but I love it. And the instructions and materials are top notch. The wires are so thin they can be a pain to work with though, and I'd recommend soldering them. They don't appear to have the Skyline kits in stock anymore, but I could scan the instructions for you (since that's the only difference).
http://www.toyeast.com/subcatlist2.asp?catid=601&page=1