2 speakers in each of the front doors and 1 speaker in each of the back doors; that is 6 speakers in total. On the front doors the tweeter is mounted high on the front pillar of the door. The mid-ranges are at the bottom front front of the doors. On the rear doors the mid-range is mounted on the bottom front of the doors no tweeter.
I can't speak to the size of the speakers, however any stereo shop has reference books which indicate the standard size for the mounting points.