It should be in two places, a data plate on the dash and on the left front frame rail (on the outside of the rail, under the fender). You might have to do some scraping to find it. The frame number is the manufacturer's number and will not include the hood number. Usually, but not always, the hood number is included with the frame number when stamped in the data plate. I get the impression that your VIN # data plate is missing. You might find the hood number stenciled someplace in the cab, like on the doors. The hood number might still be on the hood and covered with layers of paint.