The piece from my Volkswagen Passat B6(3C) front right central vent that adjusts the ribs was missing and I decided to mock up a stl after the left central vent and reverse it. Printed using black ABS and it works/looks like it belongs there. Not sure if it fits side/rear vents and other models from this era such as B7 passat, golf 5, touareg etc.
The author hasn't provided the model origin yet.