I told Dandle that I'd post a pic of the cradle that fits the GSM phone prep bracket but of course some others may find this useful.
I have the new style prep where the cradle goes in the armrest but the mounting is the same as the dash version.
As you're no doubt aware, the kit is capable of communicating with the phone via bluetooth without using the cradle so you don't strictly need it. Beforehand I was under the impression that all the cradle did was charge the handset and connect it to the roof-mounted aerial, the connectivity was still done via bluetooth. This turns out not to be the case.
If the phone is inserted into the cradle then the kit uses this for all communications and disables the bluetooth. The main advantage of this appears to be speed. The call lists and phonebook synchronise much faster in the cradle than they do over bluetooth.
The cradle itself seems solidly constructed and fits the phone very well with no rattles. It has a solitary button at the bottom of it which is used to invoke the speech system and functions exactly the same as the right-hand button on the MFSW so this could be handy if you don't have the wheel but of course it's only really of use with the dash mounted version.
Hope this info is of use to someone :)