That gas tank hook bolt looks almost just like a trunk mounted GM spare tire hold-down hook bolt.
The original bolt was longer than needed so you could get the nut started and use it to pull the tank up, there was a notched section on it so you could break off the extra after the bolt was tightened.
The original bolt was longer than needed so you could get the nut started and use it to pull the tank up, there was a notched section on it so you could break off the extra after the bolt was tightened.