04 - FOR INSTALLATION ON THE LEFT AND ON THE RIGHT,MECHANICAL SPECIAL SIGNAL SYSTEM In connection with SA: 56056 Model designation: 116 - 020/024/025/028/029/032/033
05 - FOR INSTALLATION ON THE LEFT AND ON THE RIGHT,ELECTRONIC SPECIAL SIGNAL SYSTEM In connection with SA: 56279 Model designation: 116 - 020/024/025/028/029/032/033/036