far as i'm aware they are only suited to sloping annexe and not the tall type you are on about. you would have to extend the corner ties a considerable amount. tall annexe inner tents can be purchased for around £40-£50
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I have a Universal Inner (Lichfield) in a tall Dorema Annexe. We had to use some bungee rope to extend the corner ties but wouldn't say a considerable amount. Looking through the caravan window as I type, it definitely would be too tall for the sloping annexe we had last as it is only about fout inches from the roof of the tall annexe.