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It is the only nut we have used for about 6 years, works on all S197 and S550's. Technically it is a 2 piece nut, the washer floats on the nut for more accurate torque, has a large face so it induces a ton of load on the wheel bearing assuring it is preloaded correctly. Plus stamped sheetmetal on the old nuts is ancient tech.Ah ok, in lots of pictures it does show the oem two piece nut