surprised it took this long These are unobtanium. For those who do not win the lottery there are other solutions such as gazing balls - I have provided an example but do not remember the correct size. When I had a Tommy this is the solution I used - it worked and looked great.
here is an example for a 10" ball. Perhaps the OP can share the dimensions on his OEM ball once he closes his sale? good luck to all
ebay.com link: Russco III GD137715 Stainless Steel Gazing Ball 10 Silver