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This Diaphragm Spring is made by the OEM supplier Sachs and equivalent to the BMW supplied part in every way.
Whenever you replace your clutch disk, it is imperative that you also replace this part to ensure that you get the longest life and best performance out of your clutch. Also replace the Pressure Plate and the Pressure Ring and always use new bolts!
Equivalent to BMW part # 21 21 1 338 508 (21211338508) which was preceded by BMW part # 21 21 1 242 353 (21211242353)