I've never seen the 68 SS style wheel cover on a 69 SS. Some parts books show it, but I don't see it mentioned in any of the literature that I have. The SS features pages in the 69 ordering info clearly shows a standard P01 cover for P01, not the SS cover.
But if you ordered P01 on an SS in 69, did you get that SS cover?
The parts books also show that SS cover being on a 69 Nova SS, btw.