After a bit of searching of the forum I stumbled across lightningmarks Tourer roof bars that he shortened to fit Saloons, mentioned and photographed in these threads:
https://www.the75andztclub.co.uk/for...d.php?t=263716
https://www.the75andztclub.co.uk/for...d.php?t=264428
I have tried to buy these off Mark but no luck so far.
Any ideas how he might have managed the job? Cutting them down may be easy, but re-joining them with any strength?