Unfortunately we don't offer a 2-step for the 11+ cars at the moment. Reason being is its a very low request option and it was pretty temperamental on the 05+ Mustangs. With the computer systems being so much more sophisticated than the 99-04's it was hit or miss!
We'll look into this for you a little more and see what we can do. I'll let you know as soon as I have more information! Let me know if you have any further questions and I'm sorry I couldn't be more help.