What is it?

I recently ordered a new floor pan and trunk floor pan for my 72 duster. I received a bag of misc. brackets with them. (picture 1) I do not know what this one is or where it goes. There is 2 of them. I also got one other bracket(picture 2) that i believe is an emergency brake cable bracket for a B-body. Why would this come with a floor for an A-body?