Dan, the 16s are BFG.

Has there ever been an official source saying 18s would ever be offered?

 

Also, when was the last time 18s have been offered as a factory option on the Mustang? I can't remember any recent ones?

 

Oh yah, forget about the 16's.

Yes, the vid of the guy putting the car on the trailer on the Pony Drive. The announcer said the 18's would be offered within a year of the launch.

Also, BFG's ad shows a pic of the 05 with 18's. And, BFG's website states that they are providing both 16" and 18" wheels for the 05.

 

18's came standard on the 2000 Cobra R with BFG KD's.