'73 bumper brackets on a '76 ?

The complete set up will "hurt" you if you are not prepared and you unbolt it. I'm not joking. I've cut about 30 lbs from behind the bumpers, but now I want to eliminate the shock and brackets that bolt to the bumper. Ideally, I want aluminum brackets from frame to the chrome bumper. However, if '73 bumper/brackets will work, that is what I'll hunt for...
I've got a set, and the core, we removed the front core from my 74. I have a Bro in NC, that I sold a damn near perfect 76 Feather Duster deck lid to, for 300. He came down, we talked, did the deal, and he turned and burned back there. He found them by accident in a bone yard in SC and mailed em to me.. hurt a Lil on shippin" !