YES it is.
All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
3200
85 mph.
Generally, a stock silverado will have four speakers; two in the dashboard and two behind the seat.
Was built for R12, can be converted to R134a.
It is inside of the fuel tank.
In the gas tank.
.035 gap standard and stock
1157 1157
YES, It will bolt right up with NO modifying.
how to release serpentine belt tensioner on 1991 C1500 Chevy Silverado?
What engine? V8? 18436572 for chevy 1991 silverado v8 350 diagram