The front speakers are 6.5" (round) and the back (in the extended cab doors) are the 4"x6" size.
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.
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 Speaker 6.5 4 Front Tweeter 1 1 Rear Speaker 4X6 2.5
6.5" round speakers.
Yes
Front Door Speakers are 6-1/2"
Stock speakers should be 4x6's