Summary

Those simple number plate holders secure the plate with a basic clip.
These holders are commonly used on bike carriers and trailers, where clips often get lost.
I couldn’t find an existing model, so I designed one myself.

These plate holders are sold by Pro-User, EUFAB, and ANWB and probably more.

Printed in PLA, on it's side for strength in the needed direction.
Rafst can be used for print stability and bundeling more clips.