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For the head unit you will need to buy a mounting kit which will convert the hole from a din and a half to just a din size unit. They cost like $20. You also need the wiring harness also. They cost like $10 - $15. They also make speaker ones to I just used "T" taps. It is not the best way but I had them laying around and it worked out fine.

The front doors are a little trick but not to bad. Unscrew ALL the screws. There is one by the handle, 2 on the button edge and 1 on the outer edge. There are 2 more right under the handle that needs a large hex to undo. Also take off the cover by the mirror. Once you take the cover off by the mirror which just snaps off, grab a slid your hand down the edge and pull, keep slidding and pulling. Once you get all the saps left and it should come right off. There is a wiring harness for your doors and windows on the panel undo this and there is a little pin for the handle arm. Be very careful with this piece since it is very soft pastic it brakes easy. Just pull the arm up and you should be cool or I just leave it and slip the panel out of my way a little. There is enough room to work without removing it. You should be able to handle the rest from this point.

The kits and stuff you should be able to get form etronic's. If they don't have them try your local car audio shop or best buy, pep boys or any please like theses.

About the back speaker most 5x7's will fit 6x8 wholes since they line up the same. Depends on the 6x8 it will fit in some 5x7 holes as well. The speakers are 5x7's. I have purchased 4 different kind of speakers for the rear to see what sounded the best and they were all 5x7's.