Power booster won't fit?? PLEASE HELP!!!

I did not pay attention when doing the swap as I was swapping off a parts car, but just in case this is your question, I do believe I remember a bracket type deal attached to the back of the booster and then that slipped over the studs sticking out of the bulkhead to attach it.

My car is a '71 Dart and the brake system is off a '73. Not sure if that is any use to you. Happy to take a snap or two if needed.

Cheers