ive just bought a set of roof bars and rack from ebay . its from a 98 swb voyager and i want it to fit a 2004 voyager .. looks like i need to drill the roof and fit roof bars first..it comes with 2 wide roof racks.. where does it go?? it is roughly 1.5mtr long it is the correct width but where do i position it.. any help would be grateful... they are moveable racks that click into place if tahts any help