Early A-Body Trunk Light Option??

I found a 63 or 64 Dart GT convertable in a junkyard, it had a trunk light in it, appears to be factory, was this an option? I have never seen one, I bought it and will post pics later today. It has a bracket the bolts to the gutter under the trunk gasket on the left side, it has 2 screws and a switch in it, the light was mounted under the front edge of the deck lid under the gutter. Thanks! :D