what is this piece? ax4n
 

03 sable, 24v duratech dohc. ax4n. Pulled the trans, and this fell out onto the floor. I can't see where it came from, and don't know where it belongs. It appears to be broken in half, but cant find the other piece. I suspect it is a factory installation aid? Anybody have any idea? It is hard plastic
https://cimg4.ibsrv.net/gimg/www.for...484f990132.jpg