1971 Duster Twister Rallye Wheels without Center Emblem?

The promo posters and ads I've seen show hubs and dust cap painted the same silver as the rallye wheel.

On the ad above it looks so....silver center caps on the twister, dark grey on the 340....

But generally they changed the colour of the center caps for Rallye wheels in 1971 to a darker grey.

And in this ad the Sizzler has also dark center caps:

1971demonsizzler-jpg.jpg