I need help!!

Im buying wheels this weekend for my xb2 but I don't know what size or offset to go with.

I want to go 18s and I know I want to go wide and get that flush look but I don't know what my fitment should be. I don't mind stretching my tires just a little bit and I am also willing to roll my fenders. Does anyone know exactly what rims size, offset, and tire size would be best for my taste?

HELP!!

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