The part numbers are CTSVW002 & CTPIONEERLEAD
Its actually 2 parts.... you will need
one is for the control box which is universal and then the specific head unit.
I picked mine up from ebay uk
http://cgi.ebay.co.uk/VOLKSWAGEN-Stalk-Steering-Wheel-Control-Lead-CTSVW002_W0QQitemZ270512215458QQcmdZViewItemQQptZUK_Cars_Parts_Vehicles_Terminals_Cabling_ET?hash=item3efbc8d5a2
Log in with your ebay and use paypal. Mine came in about 2 weeks. Way cheaper then anyone stateside.