4x6
6x9
It depends on the year of the Alero. But for most General Motors vehicles the speaker size is 4 inch by 6 inch for the front door speakers and 6 inch by 9 inches for the rear.
4x6
i believe the door speakers are 4x6 inch and the back speakers are 6x9 inch but i am not sure.
6x8 according to www.crutchfield.com
They are six inches. I own a 2001 mirage and just changed the speakers today.
You remove the door panel and the speakers are held in by two tabs. you just push in the two tabs and the speaker pulls out. The speaker itself is screwed into a housing with 4 torx screws. the separate tweeter just pulls off the door.
Should be same as 2001 setup where you have to remove interior door skin to acess speakers, and the 2001 had 4"x6" ovals in doors.
Front (in dash) speakers are 4"
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.
4 inch front speakers and 5 inch rear speakers
the front speakers are 4"x6" the rear speakers are 3-1/2"