Generally speaking, there's next to nothing from a F model that will simply bolt right onto an X or R model.
Again - this comes back to Yamaha being major a-holes with the naming designations of the motorcycles.
Our r's and x's are completely different machines from the ground up.
That doesn't mean with "some fabrication" that some things can't fit, but how much money and time you have to sink into getting some things to be interchangeable is a risk only you can judge worth taking.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs