Doing that will not be as easy as you think. To me, no matter how good you do of installing them they will look ghetto. And they'll sound no better then what you have in the rear deck now.
Even after doing my rear deck, even though they sound allot better, I wish I had done my doors first or kicks.
http://i215.photobucket.com/albums/c.../Photo0258.jpg
http://i215.photobucket.com/albums/c.../Photo0256.jpg