Bumper Help

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:
That is one problem.I need someone who REALLY knows these things ,to look at what I have.I hate to spend a ton to find out it's unusable.Thanks,Sam.