Tail light lens

Your car probably didn't come with BU lights. It would have an all red lens instead. It would still have a chrome bezel, but, a red center lens instead of a clear one. You can put backup lights in your car if you want. You'll need the correct outer lenses, pig tail sockets, and you might need the switch and wiring up front.
So are you saying that that pigtail is not for a back up light?