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Most D-Link products that have CAT cabling are 3 ft in length.
The cable that ships with the unit is rated at Cat5. Although I don't recall the exact length, the cable that ships with a ShareCenter is somewhere in the range of 1 to 3 feet. I don't think the cable length is relevant to reselling your DNS-320L so much as providing the proper cable type (i.e. Cat5).
Thanks for the reply. Today at Best Buy I found CAT-5e and CAT-6 cables, but no CAT-5. I would think that matching exactly doesn't matter as much as getting at least CAT-5.