Bucket seat part

[1964Barracuda]

This part fell on the ground as I was disassembling the bucket seats on my '64 Barracuda. What is it and where does it go? Any help will be greatly appreciated.

 

[Demonracer]

I believe that holds tension on the wire that controls the seat slides. I think it hooks under the seat and the tension wire goes into the small end hook.