Brake Booster "support" bracket difference?

So i got my booster rebuilt, after trying a NEW booster which was faulty and modified the OE bracket so my question is are there different bracket more than the bigger on and the smaler one? The one on my 70 Charger (the one on the drying rack) had 4 holes for the booster and 2 smaler one on each side of the big hole in the center. Another one from a 69 GTX dosent have thoes 2 smaler ones.

The '69 one is for power brakes. the manual brake plate will have a different shaped large hole as well as 4 holes for the master cylinder. I don't know squat about e-bodies.