This thing is just not available as a separate item.... but there are other similar products (aftermarket) that can be substituted/adapted, with a little alteration work.
I'm surprised 5SDude (Ron) has not taken up the mantle on this... I know it's sheet metal fabrication vs. the billet machining he does, but there's at least few folks that could use one of these.... and who knows, it could lead to new business. Now that I think about it, it might be easier for him to fab a replacement unit that is actually superior quality out of angle aluminum vs. sheet metal (plating/painting, etc. required).
What say ye Ron??? Got a programmable mill that can spit these out?