Crutchfield.com has a easy to use tool to find out. It asks you the year, make, model, elt... An alero has 6x9 in the rear.
6x9
I am a newbie when it comes to this stuff but i found a ABS box in between the two rear speakers.
The thermostat is located on a 2003 Oldsmobile Alero in the thermostat housing. The thermostat housing is located on the rear side of the engine block.
The fuel filter can be found in the rear of the vehicle on a 2004 Oldsmobile Alero. The filter is located directly under the trunk area.
top right rear of engine.
There are two pull down ropes in the trunk near rear speakers. One for each side, pull down to unlach seat and fold down.
at the rear brakes. remove wheels, & brake drums, adjust rear brakes to specs, and the E-brake will automatically be adjusted.
The door speakers in an Oldsmobile Aurora measure 6 inches by 9 inches. These speakers are located in the rear deck.
Integrated into the rear windowof the car. You have both the rear defrost lines and the antennae all in one!
towards the rear, just ahead of the fuel tank.
Attach the wiring harness to the back of your 2002 Chevy new rear speakers. Secure the rear speakers with the retaining screws. Put the rear speaker covers on.
The 2004 Oldsmobile Alero fuse box can be found in the engine compartment. The location of the rear defroster fuse will be listed on the inside cover of the fuse box.