Simmerings of engine, set (MZA) - Simson S51 S53, S70, SR50, SR80, KR51/2 Note: Set contains 4pcs. Seals are two-layer (two inner sealing surfaces). 20x47x7 (crankshaft right)20x35x7 (crankshaft left)22x35x7 (clutch cover)20x30x7 (drive shaft) Can be used for: Simson S51 S53, S70, SR50, SR80, KR51/2 The product of the MZA, which is the exclusive holder of the SIMSON brand.