What are this things called

[markallen]

I've been up all night doing last minute preparations for cruising the coast and one of the things on my list was to put on my new arm rests that my fiancé bought me for my birthday two years ago. I removed my door panels and cleaned and painted them and when I tried to put them back on, I noticed that the little white plastic things that hold them on are pretty worn out, so much that the armrest screws and the little screw on the back of the door panel is pretty much all that's holding them on.What are these things called, and where might I find them? I tried to look on LMCs website but I don't know what they're called.