I also use these rubber mats and they work really well for the snow and mud here; the slight fit problem on the front passenger side is trivial. The driver's side mat has holes that match the hooks on the car floor to keep the mat firmly in place. For $81 they are well worth it:
http://www.nissanaccessories247.com/lea ... 99E4-8X000
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Use coupon code FREESHIP to get free shipping. Mine arrived via UPS.