I just ordered on for my 97 Mark VIII and went through a litany of questions. There must be differences. I pulled one off of my 95 Mark VIII I've been using for parts, with the intention of putting it on my 97. After all the crap I had to go through to get the old one off there's no way in hell I was going to take a chance and finding out it was wrong.
ALSO, these things are only $60 dollars new. The dealer charges only 1/2 hour to replace it!!!! I screwed around the better part of the day getting mine out and decided I'd let the dealer install it. By the time I got done it would be totally screwed up. I feel sorry for the guy who has to replace it if he's only getting paid flat rate. I plan to give him a tip for his efforts if that's the case.