Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

Hey, tomorrow i am buying a friend of a friends sub, amp, head unit and cd changer. All cables are included apart from the cable that connects the head unit to the cd changer... I was wondering if any knows the kind of cable needed or will it depend on the head unit and cd changer ? If so i will come back with the makes and model tomorrow.

Thanks