we have a problem with that down here in florida. There is a couple different lens restoration kits out there you could try. I Have the mothers (I think) powerball kit and it works pretty well. If its bad enough that you have distinct lines, you can wet sand the lens to clear it up. As for recoating the lens, I don't know. I didn't even know there was a coating on it, I though the discoloration was related to the lens itself getting oxidized. With the powerball kit, it does come with a lens filler/polisher after you buff out the lens.
I also don't think you will find new housings. I was going to do that for our subaru because of the headlight discoloration, but found that its basically the whole headlight assembly or nothing. I might be wrong for the viper, but odds are that you would buy the whole thing. If you can post a picture, I might be able to help out a little more. Also, try posting this in the detailing section, there are some smart guys that reply in that section.
