Mopar did make an early cross ram in long and short versions. I do think that the short ram was reproduced by the after market. They may be hard to find but they are out there. Good luck.
I'm just getting started on my '67 Valiant 2dr post. So far the only rust i've found is in the front floors. They are bad but I now have new floors for it and will start on them soon. I have pics and will add them as soon as I figure out how to post them. Yes, I'm extremely computer stupid.