I agree with the G-Man,

It is only on your buildsheet/ Not on the fender tag.
The tuff wheel option was used on the power steering cars and the standard wheel or the rimblow was used on the manual steering cars usually.
One of my 72 GSS's has the factory "tuff wheel" since new,...
And so I took a look at the fender tag and in my case it is only on the build sheet, But not the fender tag!
It will also be on the dealer invoice also BTW.
Just my two cents worth...
Grant Eaton
eaton Gear Corp
Eaton Superchargers and Champion Steel.
407-947-9005