they are 5.25 inch round just replaced mine in a 99 intrigue.
The door speakers in an Oldsmobile Aurora measure 6 inches by 9 inches. These speakers are located in the rear deck.
4x6
my Chevy blazer 2001 4 door has 6 speakers
What size speakers go on the rear of a 2001 Buick lesaber
Look for screws in the door panel, once all screws are removed there are little clips attached to the door panel holding it to the inside door skin, because because you'll have to disconnect all the electrical for the windows and mirrors, once door panel is removed you have full access to the speakers, should be 4 8 or 10 millimeter bolts holding them in.
It is on the side facing the pasenger door when you open the door
Door speakers are 6.5". Rear speakers are 6x9".
6.5"
unscrew speakers cut of connector connect wires to speakers screw speakers in replace cover done
Pull the inner door panels off and the speakers are mounted in the door.
6 & 3/4".....
5x7 or 6x8 will fit