Courcrew, I would say the simultaneous failure of the speedometer and both odometers does sound like cable, although you can't rule out total gear failure. I detached the cable from the front wheel and an 8" length of the inner screw drive fell out. I have a 2010 America (mech speedo) and at BikeBandit the cable is called:
CABLE, SPEEDO DRIVE 139087
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