That's cool, I just like the sports/racing look of the wheel with the allen key cap. The later style has more of a Premier/Statesman look and that goes along with the lack of GTS guards and the twin headlight front I suppose. Thinking back I guess when the van craze was in full swing (around the time HX/Z came out), the trend was more towards Statesman upgrades (luxury) rather than GTS (racy) on vans, so Holden probably just took notice and acted accordingly.