Now I understand the confusion Mark (I think?).
You have been reading Paul Herds restoration guide. He makes some mistakes (as I do).
He seems to think there were two different deep dish wheel covers with one replacing the other and he is confused about what was printed on what.
To make matters worse I just noticed I have the wheel covers labled wrong on my web site (although I have a feeling someone pointed this out ages ago and I never got around to fixing it along with the many other mistakes and then I forgot)
Here is a scan from the 1970 model brochure. It should clear this whole thing up. Except it will not because you will still not know what should be in the centre on your car!!