Lots of ways to fix if you have some fab/welding skills. If not, you better jump on the Ebay one's I posted. It's not a JB weld fix.
Did you try to chase the threads on the one where you say "threads are shot"?
On the other one, the nut will thread off with proper technique and then weld stud back on.
We see and understand the problem now. You need to decide which way to go.
What are you in the process of doing exactly?


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn