I don't think you'll have much luck because winter tires need to be pretty narrow to work in snow, but if anyone would have them it would be The Tire Rack, or Discount Tires Direct. Both of them have websites.
I checked both of those sites and they don't have anything bigger than 8". The only thing close is going with the winter tire put on corvettes, but that's 17" not 16", so I guess it's just not gonna happen. Thanks anyways