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No matter whether you use 16"/17"/18" wheels, as long as your tires are the correct size the outside diameter stays roughly the same. Thus, you don't need to find a new spare wheel+tire unless you want to put a matching wheel on it for vanity. I have 16" X10 wheels for the winter and 17" Bermuda wheels for the summer, both Jag OEM, and the ride is noticeably better with 17". I wouldn't want 18" wheels on this car... Anyway, here's a list of Jaguar's OEM wheels for the X-Type, you can use the names to google some photos to get a better idea.