Again, much thanks. Turns out I'd made two mistakes both related to looking ahead. I mounted the tops first and then started to mount the bottom. Then I used the bolts that came in the bolt kit I got and the bolt had nothing to grab on to. Turns out when I look really closely, it seems the nut is technically still there but seems to have been stripped and someone tapped the next larger bolt size threads. The bolt I had simply went in and out of the hole, another bolt actually grabbed the threads. That's what I get for not figuring all this out when the fender was separate and on the ground rather than trying to crawl up under and look around other stuff.
Live and learn I guess.
And I also learned Rivnuts is a thing, I'd never heard of that. Definitely will remember that in the future.
