Pioneer 2550 Harness question

[on-one]

Hi, I have a pioneer avh2550 to install in a 2007 polo, it seems I need this harness Pioneer TO ISO Wiring Harness AVH X1550DVD AVH X2550BT AVH X4550DVD AVH X5550BT | eBay to connect to the headunit but believe I need another harness to connect to the car. Can anyone advise which harness I need? Thanks

[flat6]

you'll need an iso vw harness VW Passat Touran Jetta Polo ISO Wiring Harness Lead 2 | eBay

Then you need to solder up the connections, easiest way to do it, there's about a dozen threads here Ive posted guides on how to do so