Hello, we have a 2007 Z4 3.0si coupe that from the window sticker says it's prewired for the alarm. We would like to add one to it and would rather go with an original BMW unit so as not to have an extra fob with the key, etc. On the dealer websites they only list units that are for the roadster and not the coupe. Any idea what the difference is and would it interchange with the coupe? Any other ideas on alarm set ups for the E86? My dealer seems to be confused by this also; as they said they can get one for the coupe, but the kit doesn't come with the correct brackets and they are now unavailable (even from Germany). Any input would be greatly appreciated. Cheers, Eric and Jess.