Thanks, Harold. I thought that's what they were, too, but there are already smaller brackets in place holding the door unlock rod. I can't find another place for these other brackets. They look like they're designed to hold a rod from rattling as you said.
They would fit toward the front of each door at the top inner ledge, but the paint pattern on them would put them at the angle in the picture---and, they don't look like they belong there. If that was the location, it would be to support the door panel.