Door cards.. I guess I miss understood. I thought you were referring to whole door panel. Held on by plastic screw in door clips. I guess the " door card" is further up near armrest? Never played with it. There's nuts on the back? If it's similar to the emblems I'm assuming a deep socket. I thought you were working on removing the actual panels from door.
Yes I'm aware of that. supposedly these nuts are called escutcheon nuts from gm they hold on the door panel leather card insert from the back side of the door panel