Small Trailer License Plate Adapter
thingiverse
This is an adapter for attaching a small trailer plate to the holes of a normal size license plate mount area. My trailer came with a mount for a larger plate but my county would only give me a smaller plate. The small slotted holes were made this way so that I could just screw into a 100% infill part. Nut and bolt would work fine to but you may need to drill larger holes if you go that route.
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