You'll want a cover that custom fits each side of the seat so that each part can still tilt forward.
They cost a bit more, but a custom cover is best for that type of seat. The bucket covers won't fit over each side and a bench cover won't let you use the center armrest or use the independent tilt functions.
Here's an example of a custom cover for the '92 60/40:
http://www.gtcovers.com/seat-covers/...at-covers.html