Mercedes V-Class 447 Easy-Pack Tailgate Guiding Block (Update)

Designed to eliminate the rattling noise from the tailgate.
You are going to need 2 of those...of course...

Update for dual extruder:
Print 'Block 1.stl' with PETG and 'Block 2.stl' with TPU. Maintain the position of both parts in the coordinate system of your slicing software.