Hey, I replaced my rear speakers and this is how you do it. You have to remove the whole carpeted panel, not just the speaker covers.
1. In the back seat you have to remove the
Seat-back portion of the seat. There are 2
U-shaped hooks are holding it on. (Lift on both sides and pull up and out) If you are not sure what I am talking about you can crawl in your trunk and in the very back top right and left corners you will see the hooks holding the seat back on.
2. Next you have to remove the top carpeted panel that is covering the speakers (the Whole thing) there are bolt and screws holding it down. After you remove this it is pretty self-explanatory.
It really is not that hard. Just need about 45 min and little patients. =D
Have fun
Later