I've been wondering about that too. The rubber strip with the licensed shaped recess seems totally separate from the shin scraping bracket that bolts under the bumper.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine