89 Front seat interchange?

The front seat on the '89 DeVille is looking pretty ratty, and given the cost of recovering the leather, I was thinking of checking out the boneyards to see if I could find a good replacement. 60/40 with the soft armrest.

My questions are: (1) What years will interchange with the '89 with a straight bolt it down-plug it in-no drilling no filling type job, and (2) What's the best way to approach the job as far as getting the seat out and the new one in?

There are a couple of good yards nearby (east San Fernando Valley) so it should not be impossible to find a decent seat in an acceptable match color.

85-93 will work. i reccomend at least 91-93 because of the comfort difference. you may have to swap wiring harnesses like i did on the seat motors but thats not a big deal

Thanks! I knew eventually I'd get a reply.