The standard M5 mirrors will not just fit straight on as the base is a different shape. I have looked closly into this mod and the M5 mirrors on the LEMANS X are specially made for it. It uses the original X5 base which is molded at the point where it meets the M5 mirror, so to do the conversion, it would involve buying a set of M5 mirrors, then removing the mirror from the base, then having a VERY VERY good body shop custom mold the X5 base to work correctly and line up correctly with the M5 mirrors. I'm seriously thinking of having a go at this mod.
The M5 steering wheel is a simple swap although I'm not fussed on it as its quite large plus if you were going to do that mod you may as well opt for the e46 M3 wheel or a step further and add the SMG wheel.

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