Seat belt stiffeners for Dacia Duster

The second and third generations of Dacia Duster (Renault Duster) lack seat belt stiffeners on the back seats, and because of that the buckle is hiding in the seat when fastening the belt. Those stiffeners eliminate this problem.

I suggest printing from at least PET-G, preferably ABS or ASA (PLA is not suitable for the temperature that can be reached during summer in a closed car). I suggest printing 100% infill at least 10 mm from shorter side corners (see in photo, I stopped during printing to showcase this). The rest can be printed with either 100% infill or lower.