The stock front door speakers on 97- 01 lumina are 5.25 round but the depth of the speaker is an important dimension since the speaker is front mounted in an enclosure which is mounted to the door. I replaced my stock speakers with Sony Xplod model XS-R1342. Any 8 ohm model speaker with similar dimensions will work.
6.5" front and rear door speakers
3-1/2"
6 1/2 front and rear
The size of the stock rear speakers in a 1991 Chevy are 6"x9". You can go to crutchfield.com for any other car stereo needs, just provide the site with some information on your car's year, make, and model, and body. From there they will provide you with the correct speakers that will fit your car. I hope that has helped!
3-1/4 in front 4 x 10 in back
in the front doors their 6 1/2 in the back for a pickup their 4x10
3-1/4 in front 4 x 10 in back
Stock speakers should be 4x6's
go to crutchfield.com and they should tell you the speaker sizes for your vehicle.
the size of the speakers are 6.5" round
the stock speakers are 4x6 inches
http://www.crutchfield.com/S-96jByR9lvTK/app/car/mycar.aspx ; Front speakers : Dash: 4x6" : Front Door: 6-1/2" ; Far rear speakers : Behind Seat: 4x6"