This is a part used in Ford Focus hatchbacks (C346 from model years 2012-2018) to connect the privacy shelf to the rear hatch/door. The equivalent OEM part number is DV6Z-58519A16-AA. Instead of paying $10 each to buy them from a dealership you can print them yourself for less than $0.10.
I recommend printing the part "laying down" with supports as shown in the picture. The shape will be a little rougher than printing the part standing up, but it will be much stronger against the shear loading it experiences while on the vehicle.
I used ASA, but PLA or PETG should also work. I printed one at 0.1 mm resolution and one at 0.2 mm resolution. The one with 0.1 mm resolution feels like it has a better fit with the mating part.
The user re-uploaded this model. The user is not the original author of the model.