A retaining and anchoring device forming a retaining and anchoring section on a metal plate on a reflector includes a recess provided in the metal plate. The recess has on an upper face of the metal plate a peripheral edge or edge sections spaced apart from one another. An undercut or several undercut sections are formed below the peripheral edge or the edge sections. The recess is free of bores or passages. A locking device prevents unintentional removal of a snap-on mechanism from the recess beyond an edge section or plural edge sections which cover the undercut section(s).