Unclear, they seemed fine when I initially installed the subframe spacers a year ago. A while ago when I was inspecting the area I noticed the spacer was a bit loose and sure enough the bolt was spinning. I think there is a captive nut type situation on the other side, and maybe it just broke through the spot welds to the body? Had to drill through the head of the bolt and and push it up through. Because I don't know anything about welding, I'm hoping this rivnut does the job.How did those threads get damaged?