Temperatures in my part of the world hit around -40C, so a winter front (usually some kind material such as cardboard) will be necessary. In my past vehicles I could simply slide the peice of cardboard behind the grill and ziptie it somehow to keep the cold air off the rad, but with the cx-5 the top and bottom is basically sealed and I don't want to be redneck and ziptie anything to the front of my vehicle. Any suggestions?