OK, I received the new wheels/tires today and there's a problem fitting the rears. Basically the way the bearings & diff interface with the drive-side wheel is completely different. There's a large, constant-diameter bore on the new wheels vs. a smaller, stepped bore on the originals. The originals also used flanged bearings. Is this as simple as a bearing swap? I've attached a pic so you can see what I'm dealing with.