Screwed up trans motor mount install

Cluster99

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2007 Mazda 6i
2007 6i

Well - it looks like I cross threaded rear top bolt and stripped it. I put a torque wrench on it to snug it up and it loosened.

What are my options here? I'm seeing helicoil referenced in other forums. Problem is if looks like I would have to remove the whole mount. It's so hard to line up - my concern is that I would strip the others as well - including the side where access is just about impossible with a socket much less a drill.

Can anyone help me out with the bolt size or offer some wisdom? All the parts houses list is by part but not size. Looks like 9YA021078A.
 
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