Atlas/Craftsman 618 Bearings Shot?

I just checked the bearings I have on my disassembled 618 and looked up the bearings I bought for my MFC mill when I replaced them. The 618 has a 07100 cone (inboard) and 07079 cone (outboard), both in 07196 cups. The mill has a 07100 cone (inboard) and 07087 cone (outboard) again both fitted to 07196 cups.
 
Thanks. That settles all Timken bearing questions except for the left bearing in the MK2. Both of the manuals for the roller bearing models show that the same bearing is used on both ends of the spindle. Yet the drawing of the spindle seems to show a diameter step inboard of where the left bearing rides, as exist on all of the other Atlas spindles. Anyone have a MK2 headstock disassembled or definitely recall that the ID of the left cone was smaller that the right one?
 
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