Ok I have a 99 Camaro Coupe. I have a speaker in each door, 2 in the back seat (one on each side) and 2 in the rear hatch area (one on each side). The ones in the back seat are 6 inch, then ones in the rear hatch area are 4 inch and they also have a tweeter with them. What size are the ones in the door? Correct me if I am wrong on any of these sizes? Any help is greatly appreciated. BTW, if i wanted to upgrade my stock speakers what is the best brand to go with. Should I keep the same setup/sizes? Thanks

 

They are 6 3/4" in both the front door and next to the rear seats.
My opinion..... ditch all together the rear hatch speakers. Get a component set for the front and a pair of mid-range speakers next to the rear seats.