your front doors are 6.5 and the rears are 5.25 the tweeters I think are 1.25.
The rear doors you can fit shallow mount 6.5 but you will need to fab a new plate and ring out of wood or MDF. Its not hard you will need a jig saw to do it though and play around with the position, more forward and down a little.you need shollow mount to clear the window, if not the window will hit the magnet on the speaker. I recomend getting a roll of corpet pad(you can get it at lows or home depot $25 for 25') its the stuff that goes down under carpet in your house and some sticky spray and cut it to fit the back side of your door panels it will help the sound in your truck a lot cuts down on rattel noise.