I have an old set of thule roof bars which used to fit a citroen bx, the rails clamped under the door cavity with rubber pads resting on the roof.

If anyone is interested give me a pm. Would like to get rid of them to a good home if these cars still exist!

they are pretty much new, as I crashed the Bx and it was written off despite being very drivable in my opinion. the bars were not on it at the time.