Broken rear trunk hinge bolt

[EJP914]

Bolt snapped off today. The cup that is welded to the side panel is still attached and solid. I looked in the hole in the cup where the hinge bolt used to be looking for a nut or threads where the new bolt would attach. I didn't see anything. So what does the new bolt thread into? Also, the bolt broke at the threads. The barrel of the bolt is still in the hinge, but where did the threaded part go if I can't see the nut or whatever the bolt threads into? Thanks for the help.

[bandjoey]

jwesteng.com
there's a writeup on this right now on 914world.com about 3 days old.
easiest way to fix that.