Interesting study of Plymouth between 1956 and 1961. The tail-lights were reasonably big in '56, they filled the whole fin in the '57, then for some reason resorted to smaller lights at the bottom of the '58 fin. For '59 they just finished the fin with chrome with horizontal lights beneath, went back to full-height vertical lights in the '60 and then abandoned everything for the '61, by sticking them in pods on the side..