Holder of switchbox (MZA) - Simson S50, S51, S53, S70 Note: Product of the German company MZA. Made according to original pattern with reinforcement. Hole diameter 22 mm Can be used: Simson S50, S51, S53N, S70 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