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I would be surprised if it was very successful because the Sirocco has an L shaped zip on the side panel rather than the normal U shape.  This would mean that your awning would not be attached to the caravan at the side. 

I bought (and later sold) one on Preloved for less than the cost of a Universal annexe. There are about 4 models that fit the Sirocco - can't remember which ones they were now but I rang Dorema, who were very helpful. The main thing you need to check is that the zips are the same (think they are OPTI zips from memory but it will tell you on your zip pulls) and that it has the section which fits into your awning rail.