Series III center AC vent clip to hold floppy louvers

Hi friends, I am looking for the little plastic clip for the back of the center AC vent which allows the louvers to be adjusted up and down. Please help; many thanks!

 

John's Cars made them in metal because they always break. You have to call them on the phone to get them.
www.johnscars.com

 

Thank you Jose!

 

When closed more air gets pushed via the vents next the center vents. But if want to push more air to the back seat, yea gotta open it