Thanks again guys!
The rear is not that hard. You are better off downloading the service manual tho. There are a few screws that are tricky.
It was easy for me since I already took out all the seats and stuff.
-Take all the storage stuff out.
-The 3rd row is just 5 big bolts holding it down, and 3 little "christmas tree" type fasteners that hold the carpet to the rear underside of the 3rd row seats.
-Then I unbolted the bottom of the 3rd row seatbelts.
-Then remove the cover/trim in the bottom, center of the rear door opening.
-Remove bolts and fasteners. (see manual 9-17-19 and 9-17-20 in the 09 in the WM folder)
The irritating part is that the front of the panel has some hooks that go under the weatherstrip. Its a pain to get them back in, but you may not have to remove the entire panel just to swap speakers. Just pop off the rear and reach in.
Link to mazda 5 service manual:
http://www.badongo.com/file/2571666
:everyone should download this before it gets taken down!!!:
Works great at night. The reverse lights light up everything well. The image is reversed so that when you look into the screen, its like looking into a rear view mirror. Most back up cameras will be a reversed image, but some HUs have an option to reverse the image as well.
:edit:
shot these just for you buddy

Reversing into my Jeep Hemi Commander

You can see where the reverse lights are hitting the ground because of the reflectors. I outlined it.
This is about 8 pm with just the lights of the mazda. There are the garage lights on, but they are not very bright and not shining behind the Jeep.
You can get quite close with a back up camera