Found this on the Shop Tesla Gear site. My apologies if someone already posted it. Can only be installed at a SC:
This upgrade is only available as a Tesla Service installed option"
http://shop.teslamotors.com/collections/model-s/products/2nd-row-cupholder
Add two cupholders to your Model S rear seats. Flush mounted, flexible cupholders are installed against the lower forward area of the second row seat, placing beverages within an arm's reach. The unique design features adjustable straps to carry various sized drinks, and folds completely flat when not in use. High quality leather construction adds additional utility for rear seat passengers while blending with the Model S interior. Available as a set of two.
This upgrade is only available as a Tesla Service installed option"
http://shop.teslamotors.com/collections/model-s/products/2nd-row-cupholder
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