no dealer ever explained to me that the strut tower brace is only included with 19" wheels. I think I have every brochure and all sales literature and I do not remember any of them saying that it comes with 19" wheels only. This reminds me of the "you can only get HIDs, if you get locking wheel nuts."
INteresting though.
Dont worry about buying the stock Ford piece. Just buy the FRPP one on ebay brand new for about $115. This will not work with the cdc shaker, but it may work with the whipple upgrade.
I sold mine not long ago.
You WILL see a big difference in handling. You will corner much flatter. Some say that it is for aesthetics only. I saw a big difference when I took mine off. Even with the FR3 handing package, I wish I could have kept it.