I am not sure with the 85. Does it have the plastic clamshell back? Are you purchasing just the seat covers or mounted on foam? This makes a big difference, usually the old foam has somewhat hardened and possibly shrunk over the years.
Using new covers over the old foam, the covers may look baggy and may need some kind of liner to compensate. Buying the seats on foam may be more expensive but I think in the long run it is well worth it. After that Installation is MUCH easier.
I tried to post some pics of my new seat covers however they are over the 1 gig maximum. I need to figure out how to reconfig them or just take more pics with my other 1 gig camera.