Spring of main stand (MZA) - Simson Can be used for: Simson S50, S51, S53, S70, S83, Schikra, Sperber-BR, SR2, SR4-1, SR4-2, SR4-3, SR4-4, SR50, SR80, SRA, TS050, KR51/1, KR51/2 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