I designed this Part in Autodesk Inventor for my rear shelf because the clip part was broken.
After the printing was done i polished the remain clip part and after thet i screwed it on my rear shelf as seen at the picture.
(The screw size can be seen on the pictures at mm size)
The part that was the best for me was klammer5.stl but you can try the other wann to
3d Filament PLA