License Plate Bulb Connector Bracket

Does anyone have a source for the rear license plate bulb connector bracket? My '75 Duster license plate bulb is just hanging loose, because the original bracket that holds the light in place to illuminate the plate is broken. I'd post a picture, but there isn't enough of the plastic bracket left to be much of a reference. The bracket mounts, via a small screw through the inside of the rear bumper, allowing the light to shine down on the plate. I've looked at the restoration places and done an internet search and haven't had any luck. Appreciate any help provided. Thanks!