[dicklague]

I went through the same thing years ago with the bolt on the "B" pillar. I was making a fitting so that the pillar could be attached to the roll bar, and help stiffing the structure. I could not figure out the metric thread.

I went to a Hot Rod parts store, and the counter guy said....."you sure it is not SAE?"

He said many metric cars had SAE seat belt attachments.....he was right!