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12. The risers wont matter unless you plan on putting the apes on the risers, in which case you would need the 16.
Be sure to check your electrical cables as well. They 'should' be long enough but, better check than find out otherwise during your install.
even if you put the 12's on the 4 inch risers you should only need the longer throttle/idle cables. electrica wires-pull em out the frame, run the clutch cable up the right side of the frame and hope the brake line will stretch. mine hasnt snapped yet!