Door Panel Help

[Chevyholic]

Hey Guys and Gals,

I'm in the process of replacing my armrests and have run into a small issue. A couple of the door panel screws were frozen, so I had to drill them out. I find at most of the larger suppliers the actual door panel screws and washers, but what I can't find are the little clips/nuts that those screw into.

Any idea what those are officially called and where to get them?

Thanks!