Bumper Help

I have a 1973 Dart Sport.I have a bumper that came with it,BUT,no mounting brackets (OR)
Mine has a massive beam on the back of the bumper..No place for normal brackets.Does this call for Shock style?Can it be changed to Bracket style?
I cannot get a straight answer from anyone.
HELP. Thanks,Sam in N/E Ohio

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As said a 73 should have regular brackets, but, but, but.... That's a lot of holes in that frame...Which of them have threads (captured nuts)? Also what is the build date? If this is a late 73 build, I would not be surprised to se a 74 absorber style used. Every time I think I know the dates Mopar used something I find a combination to prove it wrong...:BangHead: