Here's a post from a previous thread. Possibly it will help.j I'm
considering replacing the speaker in my '98 LE also, so let us know
how the job goes.

http://tinyurl.com/3yg4gw

========
Just remember the speaker covers are attached to the rear shelf tray,
not
the speakers themselves, and you'll damage something if you try to
remove
them.

You need to remove the whole rear shelf tray itself to access the
bolts
that hold down the speakers

Start by removing the rear seat cushion--just pull up firmly at the
front edge where the cushion meets the floor on the left and right
side.
Next, you may need to also remove the C pillar trim panels on either
side
of the rear window.

Then unbolt the two side bolsters for the seat back and fold down the
seatback halves.  Remove the center mount stoplight (instructions are
in
the bulb replacement section of your owner's manual).  Pull the tray
toward the front of the car, leave the shoulder harnesses alone.

You won't be able to remove it completely but should have enough
slack
in the belts so you can get it out of the way of the speakers. I'm
sure
your '97 is the same as my '99 and there should be 3 screws holding
down
the OEM speakers.  If you go with after market 6x9s you will have to
drill
four new holes.  It's no big deal if you have a 90 degree angle
drill,
because the rear window makes it tight.   But if you don't I'm sure
you
can manage with a regular drill.  Then you would reverse the procedure
to
reinstall everything.
========

==