72 Duster Resurrection

I've seen those valves while doing some research but everything I've seen tells me the combo valve I have is the right one.

That is also what Inline tube said when I explained my situation to them. Also, the pre-bent brake line kit from them for a 72 duster with disk/drum located the ends of the hard lines right where my valve expected them to be.

The mystery continues. I'm trying to find someone local with some mopar knowledge to have a look.