I'm restoring the driver's door of my 1963 Impala SS (rust-proofing, new water shield and new door panel). While vacuuming the inside of the door my nozzle sucked up the item in the first photo. It was loose on the bottom of the door. It is threaded for a bolt and is pretty thick metal. I can't tell where it goes. Also, the second photo shows a thinner piece which fell off someplace on the door while I was vacuuming and I can't tell where it was located and what it holds either. I'm a bit of a stickler for putting things back where they belong so any help would be appreciated.