Alternator "pivot" bolt failure

What year?
What Engine?

Small Block... Some of the brkts may be different year to year but the basic mounting should look like this.

Car is a 74 duster, Engine is a 318 (78 block). I think the brackets are original to the engine. They are not original to the car (used to have a \6). Any way, setup looks like yours Dana67Dart.
Here is what I have in its current somewhat disassembled state.20200502_193914.jpg 20200502_193902.jpg