Where goes this piece go?

I found where it goes, it is just not make correctly as my last pictures shows. Just like the Front inner fenders, firewall, battery tray, rear outer wheel wells, its kind of a joke at this point....oh well keep fixing them.

Oh and by the way if you order the Trunk Floor Extensions do not order the Trunk Floor Extension Brace, they come installed on the Trunk Floor Extension already! Be nice if they gave you that little bit of info. Just to make it more interesting the 1974 apparently doesn't have the extension brace on them either....at least mine did not from the factory.