I went to Northern Arizona University in the late sixties. Walking to class one day I passed a '55. On the way back to the dorm I passed a '56, same color, same model. This went on for a few days till I figured it out,"55 up front,'56 out back.Doesn't take a college kid long to figure these things out,but hey, tri-fives all shared the same center body section.Well, except for the cabin air intake on the '57.