Seat tracks help needed

They came connected to the seats when I "garbage picked" them. Plus I'm talking about how the tracks connect to seat bottom.

It is from a 69 Dart; so are those studs available cause there is no way to tighten it down without having the nut interfere with the roller.
I was thinking it might help make what needs to be done clearer. Did you not get the hardware with the seats when you picked them?