Baker, to the best of my knowledge, no one makes a plug and play LED for the dash. Most of the guys have rigged up something to work in the dash. You can do some looking around and see what you can find. I'm not sure what size they are, but once you find the bulb style, you can do a search on that plus "LED" and you should get some LEDs that will fit into the factory location with no modification.
tallsville, let me ask this, where do you plan on putting the luxeon stars? From what I have seen, you will need to de-solder the star from the board it comes on and then mount it from there. But, keep in mind that a 1W luxeon star is bright as hell and the 3W ones are really impressive. A single 3W luxeon star is going to put out more light than the dome light of your truck right now. A 1W star may be the same light as the dome light. Give me some more information and then I will tell you what your best choice would be.
Ross, what is your idea? I will help you select the right size LED for what you are after. The trick with LEDs is your choices are pretty wide and it isn't as simple as going after a defined bulb and it works. If you think picking halogen bulbs is difficult, LEDs can be rather challenging. I have some 17K MCD green 5MM LEDs at my house right now. If you want to play and see what they would look like, let me know and we can make something work for you. I think I have everything here at the house to do some experiments.