06 - ONLY USED WITH BECKER RADIO "MONZA"AND EUROPA CASSETTE" In connection with SA: 56328/ 56329/ 56276/ 56028/ 56314 Model designation: 116 - 020/024/025/028/029/032/033/036
18 - ONLY USED WITH MONO RADIO INSTALLATION In connection with SA: 56033/ 56035/ 56037/ 56253/ 56028/ 56314 Model designation: 116 - 020/024/025/028/029/032/033/036