My guess is the the bed is correct, but along the way the fender was swapped out with something different and the spare tire carrier assembly added to the side of the existing bed? Does left side fender have the same wheel opening bead? At first glance the fender shown resembles one from a ‘37 Chevy, but it appears to be too wide a bead. If recollection is correct the bead was also on ‘38’s? That bead is of course absent from later models.