Thing? above the dimmer switch??

Hey everyone. I have a 1970 dodge dart custom, slant 6, 225, auto. I am in need of some help today. I can get pictures of the part I am talking about in a little bit if needed. There is this black "thing/ball" above the dimmer switch. It sticks out of the floor and I cant find where it goes. Does anybody know what I'm talking about?