The front wheel bearings for the Cooper "S" were all originally these 'roller' bearing style. The design of the roller rather g than the more common ball bearinis such that they will last much longer under higher side loading. Thus as we have developed wider rims and stickier tires it is becoming increasing critical to use roller in both the front and rear of all Classic Minis. These bearings are not only stock in the "S" but are also a direct replacement for the ball bearing type as found on most other Minis. Two kits needed to replace both sides of vehicle.