Wheel Fitment Question

The HD accessory site shows that the wheel is available for the front on '09 and above FLHRC models, but not the rear. However, the rear wheel is availabe for '00-'08 FLHRC bikes. Why HD would offer a wheel for only the front makes no sense to me. But that's another issue.
The model years for the wheel is described here. If you look up the wheel for 2011 FLHRC bikes, it only talks about the front wheel, not the rear.
In any event, my question is what has changed to prevent the rear version of the wheel from fitting the '09 and above FLHRC bikes? In other words, what is the fitment issue that would prevent someone from using that rear wheel?
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I'm finding more and more evidence that the font end was messed up as some point, though.
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