Swordfish 67411 10pc BMW Floor Mat Lock Retainer with Washer for BMW 51478116564, 51472499935, 51478183031, 51471881521 Black Nylon Floor Mat Lock Retainer with Washer Slotted Head Diameter: 18.5mm Stem Length: 21mm Washer Diameter: 20.5mm Replace BMW 51478116564, 51472499935, 51478183031, 51471881521 Series 3, 5, 7 & 8 1997-On