I think I can help you firstly here are the part no's as given to me by OM:-
90457721 Excl Heat Reflective.Excl Rain Sensor 234.79
24433002 With Heat Reflective.With Rain Sensor 272.58
24433003 Excl Heat Reflective. With Rain Sensor 211.73
90457721 is available from VX and held in stock in Uk
the other 2 are available via VX and held in stock at Opel Germany.
The Heat Reflective screens are the ones with a blue/purple tint caused by a reflective laminate membrane in the glass and is the one I opted for,suppose if yours has a rain sensor then like me you will need one of the screens from Germany it took 4 days to arrive. Can I give you a word of warning I first of all had a screen fitted by a firm that was utter rubbish
I now understand cost about 95.00 and obviously aftermarket and not a GM screen
when I brought this to Aviva (my Ins CO's) attention they put me in touch with Autoglass, who they instructed to fit the proper screen this they did to my absolute satisfaction
so full marks in my book to Aviva and also to Autoglass.
Hope this info helps you to get your screen sorted