iT ONLY HAS 1. If you craw up under the truck behind the cab on the drivers side and look up in the frame rail you will see it.
All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
No there is not 2 filters.
3200
85 mph.
YES it is.
Generally, a stock silverado will have four speakers; two in the dashboard and two behind the seat.
1157 1157
It is inside of the fuel tank.
In the gas tank.
.035 gap standard and stock
Was built for R12, can be converted to R134a.
YES, It will bolt right up with NO modifying.