General Speaker Questions.....

Ok i have a few possible dumb questions. What is the stock speaker size in the doors and in the back seat area? I looked but i guess i gave up or i am to lazy to look further into each thread so i figured someone could tell me real quick. Also how hard if there not already this size would it be to put some nice 6 1/2 in the doors and 6x9 in the mid by the back seats? I am redoing the system and speakers are all that is left. Any help or advice is appreciated Thanks in advance. Will be posting many pics of many things on my Vehicross soon. I know what world has heard lot bout me but has seen no well the wait if ova. :)

i beleive the doors are 5.5" and the rears are 4" i put 6.5" in both.. front was easy.. rears.. not so much, there was very very little material left of the speaker mounts, people have done 6x9s back there... but not easily at all, if you are doing a serious system its probably fine to just do 5.5" or 6.5" in the rears and let your subs handle the bass