The Rotor 3D/3D24 ones will include the spindle if you buy both crank arms. The Aldhu ones usually won't, as the crank arms are universal and you just add them to whichever spindle you want.
If I could find a NDS 3D24 crank arm I would buy it. However I'm not having much luck on that front.
@Bainbridge started
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The Rotor 3D/3D24 ones will include the spindle if you buy both crank arms. The Aldhu ones usually won't, as the crank arms are universal and you just add them to whichever spindle you want.