They did the mod on it for the 2017's, from what I have been hearing that will be the new jack for all trike models. If you have a jack now for the 16 and below and get a 17 you can upgrade the lift with the new arm. I know Bill G got his to work on the 17 but it was a hassle, he bought the upgraded arm and if I remember right it was over $100 for it, not sure about price though, maybe he will chime in on this. The new jack will go in the left side of trike instead of the right side, I think I have this right. You can call them and they can explain better than me.
All for now Trampas