Main Message Centre : Zafira 2007 ISO harness adaptor

My CD30 car stereo packed up and I have decided to purchase an aftermarket replacement (Pioneer FH-X700BT, to be precise). After hours spent on forums researching fitting tips I understand that an additional ISO wiring harness, FAKRA aerial adaptor an a fascia is required. Whilst I am clear on aerial adaptor and fascia, I have seen many variants of ISO harnesses on the internet for Zafira Bs, and not sure which one to go for. None of them have got pins matching my car's wiring.

I'll try to be as detailed as possible. Looking at the inside of the quadlock, I see 4 colums of 4 pin-holes each (with column 3 and 4 for the speakers - that much I know).

Column 1: 

1 - no wire

2 - Brown/white

3 - Red

4 - Yellow / white

Column 2:

1 - Green

2 - White

3 - no wire

4 - Brown

If someone could advise the right ISO harness to go for, or at least what each of the above wires do and which ones I have to / don't have to worry about, that would be much appreciated.

Thanks

Jan