[camarojoe]

That's a possibility, another thought was that the rally II wheels gave a "mag wheel" look to the car without spending the extra $ for aftermarket aluminum wheels. in 68, Chevy didn't really have a styled steel wheel available other than the rally wheel or fake mag hubcap, so the rally II Pontiac wheel was about the only decent looking factory wheel he could buy cheap to add some flair to the cars. Knowing Don, he probably had a Pontiac connection too, and got 'em for near nothing.