Windshield wiper linkage and motor bolt thread and size?

[Camaro402]

Seeing what’s the bolt thread and size for the wiper linkage and motor assembly behind the windshield frame?

 

[DirtDonk]

No idea unfortunately, so I’ll just bring it back to the top for others to see again.
My guess would be 3/8 diameter, but won’t even guess at the thread pitch.

 

[DirtDonk]

Come on everybody. I know it’s Sunday night, but somebody must have theirs pulled apart, or at a stage close enough where they can check.
Now, if we all still had great memories, and could just remember that stuff off the top of our heads, we’d be set.