Rotor (8305.1-010), CONTACTLESS (MZA) - Simson Note: Rotor 8305.1-010 for contactles ignition (version 6V and 12V). Can be used: Simson S50, S51, S53, S70, S83, SR50, SR80, KR51/2, Duo 4/1 The product of the MZA, which is the exclusive holder of the SIMSON brand. GPSR Contact: MZA Meyer–Zweiradtechnik GmbH, Baunsbergstr. 60-62, 34131, Kassel, Germany, gpsr@mza.de