Check the floors, drip rails around the roof, radiator support around where it mounts to the frame and the cab mounts. Most parts are around, check out the suppliers on the site here and others like LMC, Dennis Charpenter and NPD.
Hey Garbz for us unibody neofites what is the torque box. Is that part of the cab and box and do you mean gone as in rusted out or where the heck did it go. Always interested in learning something new about these trucks.