Size/Thread for holes in roll cage?

[boontis]

I'm looking at fab'ing some mounts for a jack/fire extinguisher/etc and was wondering if anyone has the bolt size/thread for the threaded holes in the roll cage? I'm looking at the ones near the back on the JLU roll cage. I tried searching but didn't come up with anything...

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[LazyJL]

I used a un-tapped hole in the roll bar for a CO2 tank mount. The existing holes are sized right for a 3/8-NC tap. Worked great.