I purchased a demo bike, and part of the sale included a lower height seat. I don't have any use for this second stock seat, perhaps someone who has a rip, a tear, or just wants a backup can use this. $100 + shipping.
According to Zero's website this should fit:
Zero S [2009-2011]
Zero DS [2009-2011]
Zero X [2011]
Zero MX [2011]
Zero XU [2011]