You can run a square setup, but not on the wheels if that's what you're asking. You can run have a spare set of the non-Sport X5 wheels/tires, but it'll look terrible as the X5 Sport fender flairs are made to accomodate larger wheels and tires.
Just replace your existing tires with the Continental ExtremeContact DWS tires, non-RFTs. Conti DWS are excellent all-season tires and should handle the snow just fine.
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