Here is yet another first aid wheel. I guess you can't have enough of those. It appears this one was put out by the American Red Cross and distributed, in this case, by Z&J Auto Repair of Chicago. The disk on this is 6.75 inches and the entire thing, top to bottom, is a smidge over 8 inches. It's in good shape.
This thing is a bit busy, so I think you'd have to study it well before being confronted with an emergency.