Rear cupholder for Tesla Model S

This is a rear passenger cupholder for Tesla Model S manufactured before September 2016, when rear cupholders became standard.
The design uses two straps that slide under the armrest and are joined with the holder using small nails or paperclips etc. It requires no glueing to the armrest and can be easily removed. The holder folds upwards to give access to the ventilation controls behind. The cups are hollow enough to let the ventilation pass through without any issues.

The holder itself might require some supports around the holes for the cups.

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