I am restoring a 67 Charger Hemi, which has the Bendix 4 piston calipers. In my process of restoring the engine bay, I removed the brake booster , which had a very worn out rubber boot over the input push rod. I
removed the rubber boot only to find that the receptacle shaft ( control hub?) has a chunk missing.It appears to have been used like this for many years, which is why the rubber boot is worn from rubbing against the
broken piece of the hub.

My question is can I replace the hub that the plunger fits into or do I have to buy a new Brake Booster? And if so, what is a good replacement brake booster for my setup. Evidently I can't attach any photos
on this Forum.

Any suggestions are welcome. Thank you in advance.