Wheel options 66 formula S

Can anyone tell me what wheels were available from the factory for a 1966 Barracuda Formula S? Some say the rallye wheel wasn't available until 67, some say 68. If they were available in 66 was it the same style or different, and what center would they be in 66? Obviously these are the sbp wheels. Also, I see chrome rallye wheels around, were these ever offered by the factory? If steelies were the wheel in 66 what did the hubcap look like? Thanks.