A course worker at the autocross I was at last weekend said this may have come off my '08 CR. Not sure if it's related, but we were on a broken driver side motor mount at the time. I was thinking something transmission mount related? But I don't see any sign that something is missing.

Thanks for the help!

 

Looks like number 5 in the diagram below.
It's called 50260-S2A-000 Stopper Assy., Engine


Always wondered what that was useful for, engine bump stop?