I JUST LOOKED IT UP TODAY THEY ARE 6.5-6.75 IN. SPEAKERS
The front door panels have 6 1/2" speakers and the rear speakers are 6x9"
Front door speakers - 6.5 rear speakers - 6x9
Front Door's Speakers: 6-3/4"; Rear Deck's Speakers: 6" X 9".....
Remove the door panels
For the front speakers you need to take off the dash pad and the rear speakers you need to take off the rear speaker panels.
http://prodactor.blogspot.com/2005/09/removing-door-panel-from-toyota.html
Unscrew door handles in front first then just pull off door panels carefully unscrew speakers and replace with new.
there should be four speakers,two in back window of car,two in front on the side lower bottom front next to door panels.
google caraudio and find a website that shows fit of your car
Neither, there is no such thing as a 1997 Chevy Impala
i just recently put new door speakers in a 2000 Chevy blazer. They are 6 and 1/2 in all four doors.
well 6 3/4 front doors and 4x6 on back door panels according to schoche website