I can partially answer this one as our van is also without steering wheel controls , first off you need to purchase a whole new wheel with the buttons I think there is a compatible Golf wheel which fits . Then you need to add the appropriate wiring loom from the steering wheel clock spring and hub down to the BCM . Once that's done you need to get the Computer changed to show the steering wheel controls have been added . There was a good write up on the Forum some years ago with all the stuff listed but not sure where it is now . I tried to do the upgrade to my 2005 Transporter and gave up as it seemed a dead end for that model to find the parts ,.
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