speaker replacement Freelander 2

Hiya ! Just got an Freelander 2 GS TD4, speakers in the rear doors are damaged/burned/gone and i'm not satisfied with the front ones either, basic CD 400 stereo unit is installed. Now, i need help on specs for replacement speakers (depth, diameter and max W that can be attached to the original stereo unit). Can anyone help me out ?
Thank you !

Your best bet is to pop the door card off and measure the speakers in there already.

Wattage is irrelevant as the factory HU will be aroud 12 Watts RMS per channel.