My '68 had the wagon top, no rear seat, and a bulkhead. The PO had removed the bulkhead but the screw holes were still there. Kind of thought it was a custom job. Not now. The '60s Post Office trucks used a 2WD EB chassis with right hand drive and a custom body to make it a real delivery truck. I compared it to my then new '74 Bronco. It had a real Bronco frame, a 170CI 6, C4, and a Bronco 9" rear axle. I'm not sure it could be called a Bronco, but it had the heart of a Bronco.