Would these Rims work on my 01GT?

So long as those tires have some life in them, they are a good deal. They wont look the best on a new edge mustang, but will do fine as spare wheels for winter times. You can find 99-00 GT rims for around $200 without tires. You may want to consider hunting a set of those down if the looks will concern you any.
 
My main concern is the cost of 17 inch winter tires is much more then 16 inch. I am not too worried about looks in the winter time. I live in Edmonton Alberta so I absolutely need winter tires. Thanks for the replies guys.