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.
You don't need factory speakers. Just buy the same size speakers and install.
4x6
Front Speaker 6.5 4 Front Tweeter 1 1 Rear Speaker 4X6 2.5
The front speakers are 6.5" (round) and the back (in the extended cab doors) are the 4"x6" size.
18-25 gallons
The factory speakers in a 2007 Chevy Silverado Crew Cab typically include 6.5-inch speakers in the front doors and 6x9-inch speakers in the rear doors. However, it's important to check the specific trim level and audio package, as variations may exist. Upgrading these speakers often improves sound quality significantly.
It has 4x6" speakers.
All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
Generally, a stock silverado will have four speakers; two in the dashboard and two behind the seat.
4x6 :)
4x10 rears
Front speakersFront Door: 6-1/2" factory speaker noteFar rear speakersBehind Seat: 4x6"