I called a couple weeks ago about the steel units, but the lady that answered said they were out and wouldn't carry them again.
I'm probably gonna take a set of my plastic spacer and t-guard over to my uncle's machine shop for CNC duplication out of steel or aluminum(maybe bronze or brass too). Not sure which I intend to go with. If/when I get around to doing it, I'll provide a CNC data clip to everyone that asks so that they can go have their own made. I would fearful of "producing for profit, patent infringement, etc.." if I made a batch of them to distribute.