One new FAG brand major brake master cylinder repair kit (26mm bore) made in Germany, part number RK2650, 0370-0226, 000.586.16.88, 0370-0826, or K7277. This fits:
Mercedes Benz 190 1956 - 1960
Mercedes Benz 219 1956 - 1959
Mercedes Benz 300D with automatic transmission 1957 - 1958