well its a 1980 ,as the pictures show,which its the best way to fix the brackets... just try to found an used one?...replace the hole rear bumper?...i don´t know how to weld , but i can change and replace-tear apart the pita´s rivets and use bolts? 
This its holding my restore project to start por 15 the chasis. Any help.. advice always welcome to learn more here.

This its holding my restore project to start por 15 the chasis. Any help.. advice always welcome to learn more here.