would this be the right cable to plug into my rcd300 and then into my 6 cd changer in armrest?http://cgi.ebay.co.uk/CD-Changer-Cable-for-VW-QUADLOCK-type-5m-NEW_W0QQitemZ230460897418QQcmdZViewItemQQptZUK_Cars_Parts_Vehicles_Terminals_Cabling_ET?hash=item35a88a388athanks guys