Logically the full chrome nuts were made for the polycast wheels because the rally wheel nuts didn't look right with them. The rally wheel nuts do suit the rally wheel, but I guess Holden decided that they only needed one nut and the chrome would work with both styles.

Jeza, I agree with you on both your points, the rally nuts suit the rally wheels better than chrome and Holden should have never dropped the GTS guards on the Sandman, since it's original concept was to be a GTS van of sorts.