75 Dart Bench Seat Hinge Covers

Question for all...

I have my hinge covers painted and ready to install.

But how do I secure these to the hinges? I see the holes in the hinges and in the covers, but what kind of fastener is used to secure them? There are no through holes in the seats and they couldn't go into the seats anyway, since the seats fold down.

Any ideas?
Answers with pics would be great...I'm a little slow...I mean old...yeah, old.

Thanks,

Jim
Jacksonville, FL