IIRC that hub was used on a number of the Bendix dual diaphragm boosters. One of the rebuilders may have a hub salvaged from a parts booster. You'll just have to check. Google "power brake booster rebuilders" and you'll see quite a number of them listed.

I wouldn't recommend Cardone to rebuild this booster.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".