73 Duster window sweeps

I've taken a picture of the window sweep to help me figure out what is needed to do for the correct mounting of this. THe link is:
http://armentroutsurveying.com/cgi-bin/i/1973Duster/Restoration/Window_Sweep_small.JPG
The sweep on the left side is the back side of the new one.....
the right one is the old sweep on the metal bracket I was trying to describe. I had to take it off the plastic molding that sits on top of the door panel.
I hope that this helps someone help me figure whether I utilize the metal bracket or not in the installation of the new sweep.
Hope someone can help me out.
I'd greatly appreciate it.
Greg