voyager08

I have a Chrysler Grand Voyager and I am looking for roof bars. It is an '08 reg, but the newer model. It has roof bars fitted but these are too wide for standard roof boxes, bike racks etc. The car has fitted rails, but these are more like tracks and the bars slide along the tracks. I have seen other Voyagers with the same rails, so I assume that these are Chrysler specific. I want to get standard size roof bars, but need to be sure that they will attach to these rails. Does anyone know where I can get roof bars that will fit? Thanks!