Hi guys

As per above, im swapping my Chorus head-unit to a Alpine iDA-X305.
Can anyone confirm what wiring harness I need?
I have front speakers, but no rears and no sub (confirmed by Audi - Its a limited edition [S trim equivalent])

Is it a PC9-404?
http://caraudiosecurity.com/shop/pro...s_id/1567.html

Thanks
Lee