Problem with hood spring.

There is a welded stud located on the body underneath the fender. The hinges anchor from these and are retained by a stamped steel washer/fastener that is pressed in place. They are designed to NOT come off easily. Yours may have rusted and cracked apart OR they may have been removed once and lost their tension. I don't recall the exact size but I have seen them in bins at ACE hardware. You'll need to remove the fender to gain access. Measure the mounting stud and get the washer that only fits over it with interference.