VW Can-Bus adapter radio adapter and interface for integrating car radios and navigation systems in Volkswagen Golf, Passat, Polo, Touran, Tiguan, T5 etc.: Amazon.de: Electronics & Photo
Volkswagen Polo Service & Repair Manual - CAN Bus Wires, Repairing - Wiring Harnesses, Repairing
Amazon.com: RCN210 Steering Wheel Control Adapter CANBUS Decoder Simulator for VW Passat B5 B5.5 Jetta Golf MK4 Polo 9N : Automotive
Rcd330 Plus Plug&play Iso Quadlock Adapter Cable W/ Canbus Decoder Simulator For Vw Golf Vi Jetta 5 6 Mk5 Mk6 Passat B6 Polo - Cables, Adapters & Sockets - AliExpress
Cruise Control - Retrofit - VW Polo 6R - w/out DIS - Car Gadgets BV