I have been shopping for another set of wheels for my Srt-6 coupe just for a different look. I really want to stay with OEM wheels if I can find a set off a AMG in either a 19" or 20 " staggered or not. But from what I am finding is the offset is always wrong. Be aware the offset on your XF is + 35 fronts and + 22 rears so I think your new set needs to be somewhere close to these. There is a sheet of info about what tires sizes will work with several rim sizes that I will dig up and post, its helpful when trying to find the perfect wheel. This place is a wealth of knowledge and always willing to help. Welcome to forum.

Greg in Tn