Right hand side, pull the cover forward and off (this is the passenger side equivalent to the fusebox cover). There's a screw there. Undo that. Carefully pry from there, up the front all the way along the dashboard, it all clips on from there. Pull forward, at the lip of the glass is more connectors, it should pop straight back.
The two front speakers are 6 1/2 and the rear speakers are 6x9s.
The front speakers, in your 2006 Dodge, will measure three inches by four inches. The back speakers will measure six inches by eight inches.
6 3/4 or 6 1/1
In front of the driver side tire, you have to remove the inner fender liner.
Remove front driver side tire. remove panel in tire well. Battery is in there..
There wasn't a 1991 Dodge Stratus.
I do not have a diagram, but I do have a '98 Dodge Stratus. My battery is in front of the driver's side front tire. You have to put the car up on jacks and remove the driver's side front tire, then remove a plastic cover plate, and the battery will be behind that. It's incredibly difficult and it makes no sense to me, but there you have it.
7mm hex socket
The front and back speakers are 6x9, there are also speaker holes in the front dash on the left and right. The dash speaker holes are small, like 3 1/2 or 4 inch.
In front of the driver side front tire. You have to remove the inner fender liner to access.
The battery is located in front of the left front wheel. You will need to remove the inner fender liner to access.
Remove the driver side front wheel then remove plastic skirting. Battery is on a shelf forward of wheel.