i'm pretty sure it would just be the stereo itself, but you would have to look at the harness to make sure you don't have a broken wire.
as with the front speakers those are just 5 1/4" and the door panel is held on with those damn junk tabs and in the middle if you look behind the door handle on the panel you'll see these two small little cover pop those off and you'll see screws remove those two screws and the door panel comes off rather easily. if you need i can post pics up. there's another thing with the speakers. i know on my car i have the factory tweeters which are wired directly into the factory speaker through a connector. so if you put in the new speaker that already has a tweeter in it you can just yank out the tweeter and be done with the factory one.
the speakers in my rear deck were 6x9's and another small speaker maybe 5 1/4" i'm not sure now to remove them can be fun cause you have to remove the back seat to remove the rear carpet panel without ripping it. the bench comes out easy. if you feel under the seat you'll feel these two small tabs on each side. pull each one slightly then lift on the seat bench itself and the seat should come out. once you have that out you can get the back rest out. at the bottom you'll see four nuts the two on the outisde just hold the seat down and the two on the inside which are larger than the outside ones hold down the seat and hold the seat belt buckles as well. remove all four nuts. then grab the bottom of the backrest and pull it towards you and try to push up on the seat. it might take a little bit of maneuvering to get it out but it'll come out. after you have it out. you'll see the two tabs that hold that carpet deck in pull those out there there are your speakers. once you do the speakers just reassemble in reverse order. let me know if you need pics i'll be happy to post em
