Cup holders OEM that fit to the side air vents. Ideally from a European distributor (or if someone is selling theirs and can post to the Netherlands)
MS_GR
These have them currently, I got mine from there.
www.tegiwa.com
Genuine Toyota Air Vent Drink Cup Holder GR Yaris 20+
A drink holder designed exclusively for GR Yaris that is attached to the air outlet of the air conditioner. Can store thin cans, 350 ml cans, 500 ml / 600 ml PET bottles, etc.
www.tegiwa.com
Yeah I have one on the drivers side only and I use it every time I get in the car, it's great. Toyota always comment on it at Service time and say that's handy! 
I see the Tegiwa ones are something like Tsuchiya YAC brand and not actual Toyota products? or are they the people that make them for Toyota? seems a bit naughty saying they are genuine Toyota otherwise!
I can’t remember but am 95% sure they had Toyota part numbers on the boxes and fit brilliantly and are great quality, they may make them for Toyota who knows.
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