I Put 6 1/2' power acoustik speakers in my doors, then if you wanna change out the dash tweeters, you will need 3.5 in speakers,
heres a pic of the door panel and door, take a look at the back of the door panel so you no were all the tabs are, theres 2 bolts you will have to undo.
heres a tutorial that i put up on youtube on how to remove dash speakers, it makes a big big difference.