I have a Sony Ericsson handsfree car kit (HCA-10) with Advanced Music Mute (HCE-16) which is connected with a HCC-20 system cable to a SE P900 Holder (HCH-37). I have now upgraded the phone to the SE P990. I know I need a new holder (HCH-64) but can anyone advise if this is supplied with a system cable compatible with the HCA-10 and if not whether it is possible to get an alternative system cable that will successfully connect a P990 to an HCA-10?