Tea cup tail light on drum mount

[Fairlane514]

I have an early 29 Tudor Sedan, it has a single drum tail light mounted on a stand off (round steel).
Its mounted to the body just inboard of the fender. I want to add another tail light to the passenger side. Drum style appear to be hard to find.
Can I mount a Tea Cup style on my existing body mount? I dont want to mount on the fender