Part number - Door anchor for mirror control trim

[TNT79Bronco]

I need the part number of the plastic inserts, that fit into the door, that allow the triangle trim that holds the side mirror remote control to be attached. Mine have become brittle and have cracked, and the triangle trim won't stay attached.

I have tired to find the part number, but have been unsuccessful.

For those of you that don't know, they look very similar to the top part of plastic anchors that you insert into drywall, that allows you to insert a screw. I have even tried that, but cant find anything that is the right diameter.