The nub on the end of the nose cone is ALL that is needed to locate the starter. It's been that way since the introduction of the big, large by huge Chrysler gear reduction starters. Once the starter is put against the transmission and the lower bolt is even finger tightened against the starter, it is LOCATED. There is no room for adjustment, even with the nut OFF the top starter hole. It cannot go ANYWHERE at that point. Look at the locating nubs on both the original design and the mini starter. THAT'S how they are made. The top hole is simply over sized for ease of installation. There is no need for an insert. See the circled areas.
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