This clutch disc spline hub is 6mm longer than stock and was designed to increase the total interface of clutch splines to gearbox input shaft splines to help remedy the well known clutch spline failures of the stock clutch disc. No shims or re-riveting required, clutch disc is complete. Made especially for Beemershop in Japan by a highly regarded clutch disc manufacturer. Replaces BMW OEM part# 21217670454
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