I openned it up to get to the rear speakers and boy was that a pain.. you end up taking out the rear seats, side panels, center brake light, then finally the entire rear deck panel containing the grill section.. here are a couple of pics on what it looked like:
here's a good DIY how-to that I found on it before I started my project
HERE
maybe theres something you can find for the fronts.
the thing about the rears are that its a 6 3/4" in the back, so you'll have to get an adapter plate and install a 6 1/2"..
good luck with that
Rich