What do we call these things?

Hey Kurt.
Google doesn't seem to me my pal on this one. I ran the part number, and nothing. Looked in the service manual and couldn't find anything either? From looking at the one I have, I don't think they're symmetrical. Who knows, maybe I have the roller skate and you have the key. I'm going to look around some more, seems strange I'd only have one?
I'm gonna send you a pm. I have some things I am not going to use since I replaced them. Maybe you can get some use from them.
Thanks.
Jim

I can always use parts. I still don't know what else I need for the wifes 66 dart convertible (other than all the new stuff she gets and I get to fix the old stuff for me!):D
yeah it's strange , but the tip usually breaks off on the old ones, so in your pile you might find just the piece that slides into the vent assembly. I've got the part that slides into the vent frame assembly for the drivers side (dang tip broke on it) and was just going to clay up a match for the good side I do have, looking at yours and mine on the table, hmm they are mirrored. Yours looks in exceptionally good shape too. little rusty but a little cleanup and they could be easy to do. better part= better mold.