The original "Roadster Broncos" were produced from 1966-1968. The most noticeable difference about these Broncos was the lack of doors. In the place of the steel door was a fiberglass door insert which gave the Roadster Bronco the distinctive lines we all love. Original Roadsters should have a louvered dash speaker cover plate. The door insert backing plates of an original roadster are stamped steel and are not completely flat like the aftermarket ones of today. The Roadster Bronco will have the U13 designation at the beginning of its VIN number.