It's possible. I had not considered a factory options restriction. I kept thinking a technical reason. (I ruled out aesthetic reasons).
Oddly, my car was ordered with the custom trim option which includes the deluxe wheel covers but they deleted them when the radials were ordered. It got all the other custom stuff, just not the covers. And, the Deluxe discs are the only hubcap that has that the "not on radial tires" restriction.
Oh, as an aside, I also didn't get the glove box bird that is promised with the custom option but that I guessed as being either an error or out of stock part so they ignored it.
