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Not sure about the coupe but the sedans offer a wheel upgrade pkg from the 17" wheels to the 18s, maybe the coupe has the same upgrade pkg from the 18s to 19s without having to buy a Sport???
18s came on my 2012 xCoupe. You will need to buy an X Coupe S to get the 19s...or buy them extra. They are listed on the infiniti usa.com website under Accessories. ..but it doesnt say they work on an X...as they are listed at two different widths. ..
When I got mine there was also a "sport appearance" package that offered the wheels and facia, as well as the "sport wheel & tire" package that was just the wheels. For the price, it is worth it just to go with the sport package.
I'm selling my OEM 19-inch sport rims that I had powder coated anthracite metallic. There's pics of my rims all over this site...haha. PM me if interested.