Center AC Vent Issue

[pringle85]

Life got in the way for a few years, but I am now back to reassembling my 70 GMC. I am working on putting interior parts back in the cab before setting it back on the frame. I've ran into an issue with my center AC vent. It was a factory AC truck, and I'm quite sure the vent is OEM. The issue is that my chrome vent is two pieces instead of just one. I'm guessing that I am missing some kind of clips that held the two pieces together, but don't have anything that looks like it would work. Can someone either tell or show me what I am missing? And more importantly are these available separately? Thanks for any help.