Commodore front and rear doors fit 6" speakers
6x9
6.5 all round
Door Speaker are 6x8
6.5" round speakers.
5.25"
5x7 or 6x8 will fit
Front door speakers are 6x9 but after market will not fit unless you have at least a 3/4 spacer. Back door speakers are 5 1/2.
Both the front and rear are 4" door speakers, although it is not unheard of to fit 5.25" speakers in the front, and 6" in the back. Hope this helps!
I JUST LOOKED IT UP TODAY THEY ARE 6.5-6.75 IN. SPEAKERS
Go to Crutchfield.com they list that type of info.
what size speaker fits Mazda 626 1996 model front door
Take off the inside door panel and see what might be in the way when the new speakers are installed.