Its crazy how tire shops will differ. I was pricing tires and Costco wouldn't even give me prices for non stock sized tires for my car. When I called the tire shop that I like to use the guy asked me if I was going to bump up in size on the SRT like I did on my NA. He said that they actually recommend the 285/35/19 on the rear to other XF owners now because of the better looks/handling.

BTW - what a difference a set of tires makes. A new set of tires rides SO much nicer than a bald set.......