I can attest that the ICE version rear flaps do not fit on the Lightning. My dealer tried to install them and they don't quite fit properly. Its worth the time if they're back ordered to get the proper part.
It's a known issue with the Platinum grill. That was one of the reasons I went with Lariat 511. Anything that touches it at any kind of speed will chip it.
I bought my "23 Lariat ER 2 yrs ago this month. I've never been a day without. I feel for those that have had issues, because this is truly an amazing truck!