Very interesting. I ended up purchasing a set of Z575 this past weekend. I have actually called into Z Chain and spoke to a rep for a good 15 minutes and that is what he recommended. When I first went to pick up my chains at NAPA Autoparts they gave me the Z579's I asked them for the Z575 insated and they reordered one for me. They were confused themselves as why the first time I was given Z579's . They looked in the application guide and it turns out that an older app guide called out for the z579 and the newer called out for a z575. I haven't had the opportunity to try the Z575 so I am not sure if they work yet. I am running stock 19" Diamaris.

For those who couldn't get the chains to fit, what tires are you running?