Hood rub blocks on fender

I am trying to change a hood rub block on the fender next to the hood strap.

The bolts just spin. Are there riv nuts on the fender which are bad?

Is there a nut on the inside to hold with a wrench?
I looked and could not feel or see anything?

The nuts are inside the cab, not all that hard to get to, I change them all the time by myself and I am really old.
EDIT, without the doors

Thanks for the info. I must not had my hand in the right place.....

juanprado said:

Thanks for the info. I must not had my hand in the right place.....

Click to expand...

Just put one hand on the bolt and then try to touch that hand from the inside, should be able to do it with your eyes closed.