The 'premium' kit only works with rsap phones, which most are not.
There are other kits around - most people go for the Skoda phone units, as they are more affordable and offers most features that you'd want (contacts and display on trip computer screen), but for <09 cars they use the 'OK' button instead of the phone button. But they do work with RCD510 / RNS510
Another solution is Kufatec/Fiscon kits, I have not worked on these though but from what i understand they also offer music through bluetooth.
Cheapest way, and if you don't need an integrated system, is to get a portable nav unit with bluetooth. Their navigation systems are often better and more user-friendly than the OEM systems, especially the older MFD2s...
Hope to see you guys on the road sooner or later!