During the weekend i tried fit speakers to the rear doors of my MY2010 Ambition (Sport version i UK). But I could not do a decent routing of the speaker cable from the door to the body of the car. So I want to connect the speaker cable to the contact housing just below the wires where power runs through (i believe that the contact housing on the door is part # 8E0 972 702). And then connect it to the contact housing on the body. But what size (and form) is the contacts?