Some '65 Darts came with BU lights, some didn't. That clear lens only came from the factory as part of the tailight lens. It's supposed to be attached to the red lens by the chrome bezel, which was riveted to the back side of the red lens. Over the years and a bit of corrosion, the pot metal pins on that chrome bezel would crumble and release from the red lens. All 4 lenses and bezels, both on the cars and station wagons, are unique and will not swap around to any other taillight.
