Genuine Mercedes part. There are 4 clips that hold each of the two intake air grills (below wiper blades) to the bottom. If you are planning to remove them I recommend having new clips on hand. You need a total of 8 per car.
Fits all 123 240D 300D 300CD 300TD 280E 280CE 1977 to 1985
123 Chassis Intake Air Vent Grill Square Retainer Clip Set ( 8 total )