Thank you for feedback.
Smyles, for 275/50/19 he said it will be too big for the front, since OEM is 255.
Brian, my rim size in rear is 9.5. The recommended size for that tire (conti dws 255) is 7-9in. I called tire rack and they said 255 won't fit the rear rim. Im really confused by this whole thing. Dealer basically said nothing of that size exists to fit my rims and the only way to to get a new set of wheels and tires. I really don't want that since it's a lease and i don't have 5k to throw away.