I installed the Coverline seat covers in my 89 last spring. Like rendyx, I had trouble installing them also until I called and talked to one of the installers at Coverline.
The secret is two-fold:
1) Run the bolsters fully inward. This narrows the size of the seatback.
2) Turn the cover inside out, then do a "reverse peel" of the cover. Put it on the top of the seat, then gradually peel it onto the seat, working it over the bolsters.
I found that once it was installed and while it was new, the bolster motor had a hard time opening the bolsters fully. Now that the covers have been on for 9 months, they have stretched enough that the bolsters operate normally.
One final hint: make sure that the seats are warm and that the covers are at least room temperature. The warmer they are, the easier they will stretch. I let mine lie in the sun for half an hour to make the vinyl easier to work with. I wouldn't even try this with ice-cold covers in the driveway in January.
Steve
<small>[ December 31, 2002, 09:00 AM: Message edited by: projectSHO89 ]</small>