Swordfish 67606 25pc BMW Wheel Arch Cover & Footboard Retainer with Sealer for BMW 51-77-7-171-002 White Nylon Wheel Arch Cover & Footboard Retainer with Sealer Top Head Diameter: 12mm Bottom Head Diameter: 18mm Stem Length: 16mm Stem Diameter: 9.5mm Replace BMW 51-77-7-171-002 Mini-Cooper S & SX Series 2011-On