How to replace turn signal cam on 65 Dart

OK, next question. I am putting it all together, lubed, painted column, etc. but I find this piece on the floor. I appears to be copper, is a slightly curved strip and inch or two long, with two little nibs on it. One of the nibs, shown in the photo, had fallen out on disassembly - paid little attention to it, but this larger piece makes me wonder if it is something that belongs in the column? The little nib obviously is same size as the hole, and appears to have fallen out some time in past. Any ideas what this is from/for?
dave