I went into Lidl on the way home for some milk and somehow got some roof bars for £25. I asked if I could bring them back if they did not fit and was told yes - so I got a pair. I tried them and they do fit but maybe not as well as a pair that are made specifically to suit the shape of the rail. There is a small claw that tightens against the rail. I can't say I would like to risk them with a heavy load or something that might jolt them off, but at normal speed they should be ok. All I need now is something to move!