4x10 located in the lower corner each side of the cab.
It has 4x6" speakers.
4x10 rears
All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
6.5" round speakers.
Front Door Speakers are 6-1/2"
Stock speakers should be 4x6's
4x6
4 x 6
4×6
The door speakers are 6 1/2 " round...still looking for the size of the rear ones.
You don't need factory speakers. Just buy the same size speakers and install.
6.5" in the doors. Standard tweeter size (1.25" I think).