OK, I will bite
The same upright used on a C5/C6 for the front is used for the rear. You will be able to use the drive bearing set front and rear.
The Holden that the GTO is based off of in Au has another derivative called the Comadore I think. It is a El Camino looking thing that is 4 wheel drive and is the same size as the GTO. They run an LS motor. There is your source for the front drive/transaxle.
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