The 1941 coupe-pick-up had the same front seat as a business coupe. That would be a bench with folding back rests.
The box was 66" long on the inside and extended part way into the rear compartment. Being a Master Deluxe it would have come from the factory with no ash tray but an accessory ash tray was available and it mounted in the top center of the dash.
The fuel filler would be behind the door on the quarter panel same as a business coupe. The tank is on top of the rear compartment floor and has a wood shelf over it.
Rear seat strap and ash tray????????should not be there, need more info.