1 pair of license plate holders to clamp on all vehicles with sheet metal bumpers
The brackets can be attached to your bumper at any point (of course compliant with the StVO!). They are simply pushed over the inner edge and literally bite into place when you tighten the clamping screw. The distance to each other and the height of the license plate are also adjustable.
So if you don't feel like drilling holes for nasty license plates in your freshly restored vehicle, this can help!