News:
Upper one is a rear valance bracket for a 1970.Second one I have no idea.Third one is a rear frame anchor that was used during transport. There are two per car mounted on the rear frame behind the rear end.
I believe B is a bracket to hold your Ikea dresser against the wall.
LAST PHOTO (C) IS YOUR SHIPPING BRACKET THAT MOUNTS ON THE REAR FRAME RAILS, SHOULD HAVE LEFT AN RIGHT..
I doubt many were ever removed. Most cars still have them.