Fits Gen 1 Mini Coopers with the JCW front brakes, or that have upgraded to the R56 front brakes (which is the same size as JCW)
The "S" is for street. These work great for street/autocross and light track duty. They dust a bit but are easy on rotors. Much better than factory pads for high performance use. For more serious race duty try the Porterfield R4-1.