BCI group size ( 65 )
Everything I can find indicates that all four are 5x7 inch speakers.
Group 34 lead acid automotive battery.
The 1993 Ford Explorer fuse box is located in the engine compartment. The fuse box can be found on the drivers side behind the battery box.
Group size 75 or 78.
In the engine compartment near the engine air filter housing / battery
in the fuse box under the hood the box is located behind the battery
It requires a group 78 battery. I do not know the physical dimensions of the battery. You will need to get one that has the proper cold cranking amps.
A 1993 Ford Explorer has shock absorbers , front and rear
On the inside of the fender just behind the battery. It has two cables attached to lugs, and a small wire at the bottom that is pressed on to a stud.
A 1993 Ford Aerostar takes the BCI group size 65 battery which has the terminals / posts ( on TOP of the battery )
The Northwest Explorer was created in 1993.
I do not know if this is your problem, but on my 1993, this meant I needed to charge the battery or get a new one. Once I finally bought a new battery, this stopped.