mirrors for 2017 ford expedition

Thanks for all the responses to my query about trailer mirrors for my new 2017 Expedition. Mirrors for other fords, F-150, 250 etc. do not fit. Not being able to find any replacement mirrors I ended up purchasing clamp-ons, Dometic DM-2912 Milenco Grand Aero 3 for $100 on Amazon. There is just enough room to clamp on to the upper lip of the standard Expedition mirrors. ( I do not have the optional mirrors with turn signals, but I don't think that matters because the signal is on the bottom of the mirrors and the basic shell I believe is the same.) They are easy to attach and remove, seem secure and will fold in with the standard mirrors. They vibrate a little but are much better than my old cheap strap-ons. Shame on Ford for not providing a better alternative but until they do I will go with these. Safe travels!