Vin numbers were not in the dash until the 1968 model year on Mustangs.
left hand side under dash
It is located on the left side under the dash; it is mounted behind the fuse panel.
Drivers side under dash Left of Steering Wheel
Fuse box is right under dash driver side on the left next to the door
Left side dash panel, fuse number 4, 14 amp.
Under the driverside dash or under the passager side dash
Thr fuse box is in the lower left side of dash, near where the drivers left knee would be when driving. You must unscrew an access panel.
The fuse box is above the driver's side kick panel, below the dash, to the left of the steering wheel.
Under the dash on the drivers side
under the dash on the right side!
It should be located on the lower left side of the firewall, inside the car, just above where your left foot rests while driving.
behind the dash on the passenger side.