Lately, it has been difficult to find the brass pedestals for the castings. Or, if you have the brass pedestals you cannot find the sparking acorns that are fitted in the base.
Some sizes of pedestals come in the small sparking acorn size or the large size.
At the time of this writing, this company still has many of the brass pedestals shown above that use the small sparking acorn. If you use this kind of pedestal and if you have the small acorns in-stock but not the large ones, you might consider ordering some of their pedestals.