Does your car have slimmer home market bumpers or DOT 5mph bumpers? This thread discusses US license plates on home market bumpers - http://www.peachparts.com/shopforum/diesel-discussion/287099-front-euro-bumper-plate-bracket.html

With DOT bumpers the plate attaches to a bracket that attaches to the underside of the bumper -



I don't know of a bracket for the rear of a 123. On US cars the plate attaches directly to threaded holes in the trunk. I think the same is true for home market cars but the hole spacing might be different.

Sixto
87 300D