@ched Thankyou. I know what you mean about the channel opening up. I’ll find a bit of timber to use as a mandrel. I also have a dress making tape in my tool kit as its ideal for measuring across curved surfaces, to work out the rail lengths (spotted one being used on one of the America car hotrod programs).
Just one observation from opening one of the packs. The fixing screws seem extraordinarily long! I dont have carpet lining so do you think 1/2” screws will suffice rather than 1”? I found a youtube vid of them being fitted in a T5 and the owner had to cut some screws down as they hit something inside the panel?
Cheers
Ian