Well, the three sole is just the same thing with the newest sole, the "stitch-in-the-ditch" sole (which can also be purchased seperately), included. I'm still suspicious that you were sold an "old style" (meaning to fit the older machines, like 930s) walking foot. But I didn't think you could get it as the three sole set, so I'm not sure. But that would explain why it's not lining up.