I believe that the rack that fits a cavalier is the same one for a vectra at least as far as Vauxhalls own rack is concerned. When I was after a rack I found that vauxhalls own model was the cheapest and strongest available its been in use for a good few years now and is still good. Its carried a canadian canoe for over 50miles, and regularly carried upto 3 canoes at speeds up to 80mph so I throughly reccomend them. The fitting of vauxhalls bars to a cavalier also means that there are no rubber pads etc in contact with the roof
the reason I say all this is that a m8 told me he had fitted cavalier bars to his vectra
I'm not sure if they still do them but try 'Ikea' the furniture?? store if there is one near you. They sold roof bars for most popular cars the last time I went at a fraction of the cost of most other places.
The might be called LGGA TAK P PLGA or BAGAGEHYLLA TAK, or something like lol icon_smile_big.gif