Volvo XC70 towing electrics

cpr

I've just purchased a Volvo Xc70 2010 complete with Volvo fitted towbar and electrics, unfortunately the electrics is only a black 7 pin socket for a trailer - does anybody know how easy it is to get it changed to either 13 pin or additional grey 7 pin for
the caravan, is it the same loom or has it all got to be changed?