You can see the wheel specs of the e70 vs the f15 in the chart below...along with the note they use different TPMS sensors. You can also verify which sensors you need by using one of the online part database sites like BMW Parts Catalog or BMWfans.info or www.etk.cc ...just enter the last 7 digits of your VIN then select the wheel diagrams to find the 11 digit BMW part number your f15 needs.

Also look in your owners manual for BMW recommendation of winter tire sizes to make sure the 18 tires you have are compatible for the f15 X5.

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)