Making individual LED's replaceable without removing the taillight assembly is a pretty tall order. I'll see what I can do. However, I do plan on making it "easy" to go back to the original housing. I will be as unobtrusive as possible with the stock housing. I can't say for sure yet, as I do not have a spare housing to work with...I'm still looking for one for cheap as it will be the testbed. I don't want my Z down any longer as I have waited all winter to drive it again. I'll post an update in a couple weeks when I get to my new job where I'll have more free time.