Swoops right that the number is on the front cowl, down right above where the fender meets the cowl. not sure which side.

one of 3 places
- on the front of the firewall down low around the front of the wheel well.
- or on the side where the step/floorplate is, probably on the side panel
- or on either side of the top panel/frame alongside the engine compartment where the hood meets the frame.

If the truck has been painted you may have to do some scraping