Try them all then

That is great info, thanks John. I'll be ordering that ASAP

I would take care when screwing into the side wall and look for frame joints I am sure there must be some points for the fixing of the strips not just screw into he aluminium side.

On the points of the strip. I have a little cupboard/table (not the full table) and can see it has a plastic strip which has split on the mouldings. The cupboard just sits there and doesn't move but I assume it should sit into the table strip to secure it should I have to do an emergency stop. However the plastic on the cupboard is not allow it to locate on the strip. Any suggestions? I can post a picture later this week.