Hi Kevin
You could also try Bradcot online site, you put details of caravan in and it tells you size required, normally it is ground to ground so measure from gound one end of the caravan around the awning gide rail and to ground other end, which is not that easy. Most awnings are made to fit a variable size its just making sure you get the right one. If your handbook says one size I would check what range the Isabbella covers?
www.bradcot-awnings.co.uk
Di
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