67 A/C Ball Vent Clips
 

Can anyone tell me how the air vent clips for the top of the ball vents are supposed to be used? My 67 I replaced the bezels but the old ones didn't have the clips. The were just not screwed in at all. I haven't figured out how it needs to be placed. Thanks for any info.
https://cimg5.ibsrv.net/gimg/camarof...a750ca293b.jpg