So I decided to upgrade another safety system in addition to the EWS, of course I prefer the originals. I have tried the search already and also read what I need of components: 1. The bonnet contact. 2. The rear alarm side windows. (behind the C column only at the caravan) I need with the Limo other side windows ??? 3. The door contacts only if one pole, against the two pole change. 4. The 2 interior sensors together with cable sets up to the bottom. 5. The DWA switch. 6. The DWA/ZV control unit. (theft warning system / central locking) 7. The alarm horn Do I need for the front also another reading light? have found at Ebay one with ultrasonic sensor??? so, but the most important would be to what extent the cable tree has already been presented for the whole components? If the plug behind the blind cap (for DWA) is proven, does that mean that I can retrofit it automatically?