Steve, none os my Brodak ARC/ARF models came with tanks or spinners.
However, if you search the Brodak web site for spinners, you get a few accessories. Search for spinner—singular—and all the spinners they stock appear over five pages. Go figure
After getting one of my Brodak spinners out to find the part number and look at the Brodak web site for the above info, I checked an Enya nut.
Conceptually, the prop washer with oversize hole and shoulder nut are the same on the Brodak spinner and the Enya nut and washer assembly. The difference is that the part of the Enya hex nut protruding from the assembly is only the height of a standard hex prop nut—not extended like the Brodak nut.