Early Barracuda Trunk Latch Spring/Plunger Fasteners?

The little chrome screw I found it my parts bag along with the spring does not grab onto anything, just spins in the hole. Is there a nut, speed nut, or something else I'm missing here to tighten this thing down so that is stays put? Thank you.

P.S. I you ask me, this little spring/plunger thing would have been a good place for the factory to have put a trunk light switch.