Looking at how they fasten along the rail and the side top rail, I would think you could come up with something that would work as good if not better than original for next to nothing. Just get an aluminium strip from Lowes and cut to fit bottom rail and drill holes at the correct locations to match the holes in the bottom of the saddlebags and run a few flat bolts up through them to put the wing nuts on. Just use your imagination and I am sure you can come up with something that will work just fine.
Good luck with the project..
