If you are referring to winter tires as in snow tires... your dealer is right. It will be very hard to find any snow tires in 19". You can go to tirerack.com and it should give recommendation on what wheel size is your stock wheels.
If you want winter tires, it's better to get new wheel/tire package. Probably a 17" package. It will probably cheaper to get that than trying to look for a 19" snow tire. 17" is not the looker but it's winter... Cold, slippery, slushy and dirty. Who looks at wheels when your car is so messed up with winter grime.n
