Okay, here goes ! I recently had this problem on my 05. My wonderful dealer mechanics scratched the roof attempting to " Jamb" the nut-sert while loosening the bolt....Failed !
That's why I took it to them !
Here's the quote," Our service manager feels that this is not covered by warranty since you, the owner, caused this damage."
Enough for the friggin' monkeys they call technicians !
Here's the rest of the story;
Do a google search for nut-serts or threaded inserts.
there are a few companies; I came across
AVK Industrial Products
AVKFasteners.com
They were Extremely helpful in getting me to the correct fastener and the correct tool to repair AND,,,,GET THIS; tighten the existing fasteners in your roofs.
The insert is the AL Series open-ended.
the complete repair cost me less than $25.00 parts and tool.
With AVK's insert tool, you can re-tighten your existing roof fasteners.

I was replacing my rack, hence the repairs.