My mother in law has a 2009 mazda 3 gx sedan with the comfort package. Last year she got 15 inch hubcentric rims from costco and put 195x65r16 winter tires on them (same tire size as alloys that came with car). She just bought a new 2015 mazda 3 gs with 16 inch rims and a 205x60r16 tire. She's wondering if she can use the 15 inch winter tires and rims on the new car... The dealership said no then tried to sell her a winter package. I'm looking for a second opinion...