Just been looking at Sun Glasses Holders for the Insignia, and found this one on Ebay which LMF Vauxhall are selling.
They state that although not designed for the Insignia it will fit okay, seems it fits in the place of the side grab handles, so a couple of these look worth getting I thought. Certainly cheap enough.
Then I noticed at the top that it says "Not suitable for cars with side curtian airbags" I thought all the Insignia's have side curtain airbags as do later vecs. Seems a bit silly targeting this towards Insignia owner's when it may interfere with operation of side curtain airbags.
very strange! On reflection I think I might pass on buying these...lol
Link here if anyone interested.