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I see that Scorp's mystery bolt issue is solved, well, I have one of my own.
When I put the GS back together, I replaced a bunch of the crap oem fasteners with ARP, grade 8, stainless, etc..... so I had a bucket of the original fasteners left over.
I do have this one odd looking bolt left though. I think it is 1/2-16 thread bolt that is bent into an L. One side of the L is threaded, the other is smooth with no head, just a shank.
I pulled the entire drivetrain out of the car, so it came from down there somewhere. It cannot be a critical fastener due to the fact that there is no way to torque it down. The fact that it is a big bolt is what concerns me.
Again, it looks like an L with threads on one side, smooth on the other.