Get Axxis PowerMax from Summit. If they don't carry them, then get Axxis Deluxe from another reputable place. They are slightly hard to find, but being in Chicago, you shouldn't have to hard of a time.

If oyu can't find them at all, call 216-676-5100 and ask for Chris. He will get them for you for about $50/axle. Out-of-state has no tax.