18" Wheel help

So I think they’ll work, in the front if you go past a 245 wide tire they’ll end up sticking out too far (father than my 275’s).

In the back you’ll probably need a small spacer to clear the springs.

But for a compromise to run the same rim front and back that’s about as close as it gets.
Would a 255-40 rear tire work? I was looking at the Nitto NT555g2 but they don't have a 255-40 for the rear.
I was thinking 245-40 for the front.