Recently, I accidently hit a site tap and damaged my tourer side panel (Lunar Chateau). I require a piece of thin aluminium bubble panel material approximately 15inch x 4 inch to create a patch.
I have approached Lunar, owners clubs and manufacturers but have had no luck.
Have u ever thot of looking in the skip of your local caravan dealer.My mate and i found a wealth of things just thrown out and a piece of aluminium sheeting..PS ask first.
Also try litho printers, litho printing plates are made of thin aluminium and most have piles of used plates they are waiting to scrap, can be big stuff too, 670x930mm (SRA1) for example...
------------- Just remember, if it is older than yours, smaller than yours but next to yours, there is probably no credit owing on it...
best to fill in slit with sikaflex 512 or 292 and fit a large false vent over it,sealing round as you go.after a week or two you will forget its there and no one will know.