The taillight Treatment is one of the outstanding Styling cues and the most controversial, they Held on to them for quite a while, the more integrated look of the 57-61 was best IMHO at some Point they had plans to add another circle around those tail lights for following model years IIRC.
When they went back to the tacked on type in 62 I always thought how great the rear view would have looked if they already had the possibilities of putting a narrow light band along the rear character line replacing that U-shaped Chrome Strip instead of the tacked on taillights.
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