Door jamb striker nut gone/missing?

[cruizin01]

My cab is an 87. It was mostly stripped down when I painted it nearly 20 years ago so I can't remember all the details.

So my jamb has a rectangular opening with nothing behind it for the striker to thread in to.

It doesn't appears anything was torn/broken away from the backside of the cab. Its the same on both sides.

Ive searched around and it appears there was a cage nut that was maybe welded in place originally?

I don't want to weld anything at this point as everything is painted. Has anyone just used a large washer and nut on the backside to mount their striker? I imagine the cage nut had some movement in it anyway so using a nut shouldn't be much different.

Thanks in advance.