One of my belt buckles broke and I needed a replacement.
Despite there being other designs around I decided to create my own and based it on one of my other belts.
This model does not require any screws or glue, just snap it together and you're good to go.
The lowered mounting holes are for the teeth, the higher ones for the lever.
https://youtu.be/9GmWmY2JpkQ (sorry for clumsy video)
I also included an alternative design for the buckle's lever (if that's what its called).
You can also just use the plane one to create your own design.
If its not wide enough for your belt you can simply scale it up a little. (in general or just in one axis to make it wider)
The toast adds friction and looks funny imo.
Let me know how it turns out for you