Attached are photos of my rear bumper from my 75’ Fiat Spider (the rear bumper is not original – it maybe from an AC or BC model or maybe from another car make??....I bought the Fiat like this). I trying to source a part that goes in that recess possibly a number plate light of some sort. All the fiats one don’t seem to work in my instance. Does anyone have any suggestions on what may suit my setup?