Ok, you can fit sizes 5"x7" definitely, and most probably 6"x8". However, stock speakers take four screws. The 5"x7" ones I purchased took six screws, so I had to drill, seeing as none of the holes matched up. Drilling isn't that bad, though. I did it using just a regular ole drill bit :shrug:. As for the door panel, there is a HOW-TO about removing it. There are two screws located inside the handle that you grasp to close the door, one inside the door bezel, two by the door jamb, two underneath, and two on the side with the latch, and one big screw near the door jamb but pointing straight out, not towards the side. And obviously, you need to take off the window crank if you have one. Take a flathead screwdriver or something comparable, and while pushing the panel in with your hand or something, reach the screwdriver between the crank and the panel and push out the pin. (To put the crank back on, just put the pin on the crank and shove it back on) I recommend taking off the triangular vent, and to pull off the panel, you need to pull up and out, while pushing the door bezel through the panel. It'll make sense when you go to do it. Give yourself a good couple hours to replace the speakers if you're unsure about taking off the panel.
