We have a bigger license plate in our country than in the USA. I therefore had to modify the original holder. This modification took place by peeling off the red rear reflector, because it was covered by the holder of the Czech license plate. I will stick this red reflector on the additional holder, which will be attached under the new license plate holder. Furthermore, due to different regulations in our country, I had to change the color of the rear side reflectors from red to orange.
edit: finally I sticked the red reflector directly on the Czech license plate holder
