Ice Kings blades are hard if not impossible to find. You have two choices.....
1)Take the auger bit to a machine shop with a Jiffy blade (I believe 9" is the one you want) and have them weld a shim onto it so you have the correct blade angle. Ice King blades are straight and Jiffy are angled.
2)Buy a Jiffy auger bit and put it on your unit. You may have to have the sleve on the bit modified to fit your powerhead...but I'm not sure.