No need to buy a new light. That's like buying a new car because you have a flat tire.
Walmart, and almost any auto store, carry replacement license plate brackets. Price starts about $2. Simple to install. Remove the lense cover and the light will be held on to the camper with probably 4 screws. Remove 2 lower screws, slide the new bracket between the light and the camper body, replace screws.
Or you can go low tech and use strapping from any hardware store. Galvanized thin metal strap about 1" wide with holes placed every 1" or so. Cut it to whatever length you want and place one end under the screws holding the light bracket to the camper.