If there was a picture , otherwise it is a bit hit and miss, thanks anyway.
Thank you it would have been ideal but my fitting is 6mm, I have the bolt just short of the knob.if you could use the knob 30364 and bolt 50584 from the page below, I might be able to help?
https://roofracks.co.uk/Thule-Products/Spare-Parts/_/?productID=948
Good try Harold, the knob has a hexagonal hole in it to take a 6mm Nyloc nut so that even if it slackens off a touch it wont vibrate off the bolt. I have looked at loads of websites and rung places but nobody seems to have this variant. I could just make do with a nyloc nut but I was trying to get it back to it’s original condition so that wouldn’t need to use a spanner.