Abstract: In order to arrange molded parts such as bumpers or their trim for automotive vehicles with maximum integration into the body, i.e. in order to attain a most extensively contour-hugging transition from the sheet-metal to the plastic geometry of the vehicles, the juncture between the topside of the molded part and the body panel located thereabove must be kept as narrow as possible. For this purpose, a guide rail to be attached to the body panel of the vehicle is provided which has an elongated slot formed between two webs. The molded part is inserted with a sliding seat with its strip-shaped projection into the elongated slot. The thickness of the top web determines the dimension of the juncture, i.e. the web serves as a spacer.