LED Kit help. Which Gens interior is are the same?

Hello, I run a car lighting kit website. I think Im pretty much done w/ the SRT-4 group and now need a new car to work on. So im trying to figure out which car interiors are pretty much the same from each other. Are they pretty much each Gen is the same interior. IE: Gen 1 has all the same interior as its gen. Then Gen 2 has the same parts as its Gen 2 years? Im hoping to help out with some cool lighting ideas. As im sure im not able to post my website link, I wont. You'll just have to wait or figure it out. Thanks!