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Exhaust manifold nut - 1st undersize - suitable for Simson mopeds S50, S51, S70, KR51/1, KR51/2, SR4-2, SR4-3,SR4-4, SR50, SR80. This manifold nut can be used to remedy an overtightened or damaged thread at the cylinder outlet due to the described undersize and thus securely fix the manifold again.