I found all the info I needed on the navplus forum, I used kufatec.de in germany who allow you to configure your lead exactly to your car, dont forget you probably also need an aerial adapter from Symphony to RNS, its the wrong type as standard in the car and a splitter lead for the diversity anntennae, unless you want to start hacking cables about this is worth buying.
Bose needs pins connected in the adapter lead to send signals to power the amp from the RNS without it I think the rear speakers wont work,
I didnt need to do any coding at all, even the DIS works showing all the NAV details on screen, really is an easy job, just a real pig to get the old symphony out even with the right keys,
for info the full set of leads from kufatec take about 7 days to come and are about £60 all in I seem to think
have fun