To my knowledge the computers for 89's were only used that year. So I am leaning towards thinking it wouldn't, but I don't know for sure. Have you tried one of the online junk yard places. They will send you like 10 E-mail of places that might or do have what you are looking for. I put a link to one at the bottom that I have used before. It is a little high sometimes, but that is the problem you have to tackle when you can't find it anywhere else.
http://www.junkyarddog.com/