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You can find a retailer near you here: Dealer Locator
3x3.7mm woodruff key according to DIN6888 for the primary gear pinion (crankshaft) on the clutch side suitable for Simson Moped / Mokick S50, S51, S53, S70, S83, SR50, SR80, KR51, KR51/1, KR51/2, SR4-1, SR4-2, SR4-2/1, SR4-3, SR4-4.