You have to replace the grill bar. Or it will look tacky I think.
The Opel rear badge is much larger than the square and it has many angles. I most likely have the numbers as I did this a while back.
There isn't a logo that goes between the seats. The Opel waterfall does not have any high points. It is a different piece than the Sky waterfall.
The only safe way to replace the steering wheel logo is to buy the air bag. Putting one of the hard plastic ones on makes it a bullet in an accident. They are designed to activate and go towards the door, away from your body.
A couple of years ago, all the parts were available, not sure if they are any more.
The Opel came standard with the smokers package, not available in the Sky. It also has a fog light and a switch on the dash for it. Opel GT logos on the fenders and rear quarter panels. The seats did not have a GT logo, they were the standard NA leather seats.
I was originally told that the GT had a thicker windshield, and the headlights were thicker, they appears to be exactly the same as the Sky NA headlight though. They also had different tail lights and no side markers, but did have marker lights inside the fender.
You can purchase a Kilometer/Speedo. It can just be plugged in and the Sky logo does not appear.
For 2010 the GT, and only a few, had special larger side mirrors. One was seen at the Opel Nationals in Germany this past summer.
If no one comes up with the part numbers, I will go thru my receipts when I did it, if I can find them.
I would guess mine is about the most compete rebadging done.
One thing I never found was the hood liner. Located one (was told) in Russia, but the cost to get it to the United States was well over 700.00 bucks plus the guy wanted 200. for the part. Decided against it.
The front and rear bumpers are different also.
Good Luck on your search. Some of our European members might be able to get the numbers for you. @Norbert-GT
is a great guy and will help you I am sure.