They do fit. A little lose, but if it bugs you that much there are some ways to shrink them. Also I reccomend this headband
I have it on mine and it improves long term comfort a lot. The pads help with short term a lot, headband with long term a lot. With both of these one the HFI 580's are really comfortable. I reccomend sticking some tissues inbetween the sides of the pads and the headphone, my ears touched the driveer.