In the front 6 1/2" round In the back 4/6"
4x6
1988-1999 Chevy and GMC full size the door speakers are six and a half inch on the extended cab the pillar speakers are 4x6 in. Some Silverados also had a small tweeter inside the door.
The front speakers are 6.5" (round) and the back (in the extended cab doors) are the 4"x6" size.
Front Door Speakers are 6-1/2"
6 1/2 in the front doors and 4x6 in the back if ext cab
They are 6 1/2 inch in the front door panels. If its an extended cab the rears are 4 x 6 inch. Let me tell you from experience replacing the rear speakers in a 97 extended cab is a pain, but can be done. Be cafeful not to break the panel clips then your panels will vibrate when the speakers are turned up.
I believe the speaker size is 4 x 6. When you go to sites like crutchfield.com, they usually will show the size of speakers that fit your vehicle. For my 2001 Silverado 1500 extended cab, the 4 x 6 was the size they said would fit my truck.
You can usually figure it out by going to Http://www.crutchfield.com and seeing what fits your vehicle.
It has 4x6" speakers.
6.5 in
what size speakers are in the 2004 Chevy Avalanche
it should be 6.5'' round speakers