Seat belt holder / adjuster for an old US car, at this point I have forgotten which model/make, made this part to look close to original, based on measurements from a broken part. Part is not 100& accurate, but close.
If i remember model/make/year, this will be added, also got some pictures fitted in the car somewhere - if you need this part, please add in the info for others looking :)
The author marked this model as their own original creation.