Novak Conversions Jeep Wrangler TJ radiator

Rock Sliders / Rocker Guards Guide

And that’s why I’m going with what Blaine suggested.

Me and precision are opposite but his method will give me the best chance at fixing this.

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My first thought was to fill the holes with spot welds, but my worry is if the weld isn’t flat on the back side the nutsert won’t sit flush.
Unless you can get a copper backer behind to control the burn through, you're just asking for trouble. If you could get the copper weld backer in, you wouldn't need a nutsert.
 
Novak Conversions Jeep Wrangler TJ radiator