These go into the channel at the bottom of each door. They just slide in place with a little bit of lubricant. Price is for a set of TWO.Genuine BMW E9 CS Door Seals (At The Bottom Of The Doors) SET OF TWOSKU: 51216740185 X2$66.00PriceQuantity*Add to CartBuy NowFitment E9 CSFits the following vehicles: E9: Details on E9 E9 2800CS Coupe, U.S. E9 3.0CS Coupe, U.S. E9 2.5CS Coupe, Euro E9 2800CS Coupe, Euro E9 3.0CS Coupe, Euro E9 3.0CSi Coupe, Euro E9 3.0CSiL Coupe, Euro E9 3.0CSL Coupe, EuroFitment NK (Neue Klasse)Fits the following vehicles: NK: Details on NK NK 2000C Coupe, Euro NK 2000CS Coupe, Euro