Yep, anything you want. Flat plate, uni-strut, c-channel, whatever. Just put the new threaded nut-plate wherever you need it to be for your seats and/or belts.
You could also call Dynacorn this week and see if they have anything like that, or are contemplating it. Since I'm assuming they come with them on their new floor pans, they are at least manufactured. But Dynacorn is known for not caring, or even knowing how to obtain just a single piece from an assembled component they get from China.
They would not even sell the roof struts separately, even though they're part of a kit of individual, un-welded parts!
Too much paperwork trouble most likely. I bet they even have a few scraps of them left laying around from damaged kits. Probably throw out all the cool stuff we need because it costs too much to let it take up space in their warehouse.
Just like it should be... Unless you're at this end of the equation!
Paul