how do you get to the rear speakers to change them and what is the largest speaker diameter and magnet size that will fit?

Now THIS I need help with too! The Chilton's manual was NO HELP! Does ANYONE know how to remove the rear panels without destroying them, or does the grill pop out somehow?!? Doesn't look like it!

how do you get to the rear speakers to change them and what is the largest speaker diameter and magnet size that will fit?

Hello,,, the rear speakers are 6.5 (the round ones)
The grill does not pop out, you must remove the whole back panel. I started to pry mine out from bottom up. Its cliped in place on the bottom, then pull up the top part. Its easier to pull the bottom part of the seat out a little bit. I had never done it and it took my like 5 minutes... make sure to put the rubber ring around your new speaker the way it was when you removed it. (you'll know what im talking about when you get in there)
Otherwise, its easy as hell.
Good luck, keep posted.