I had VE SS rims fitted to my VZ SV6 about 7 months ago. They were machined and fitted securely onto the hub, actually they fitted better than the original rims. Running 235/40R18 tyres and no problems at all. Used a slightly wider wheel nut, which was supplied by the Tyre fitter. They are fitted so well that unfortunately some halfwit decided to turn left from the right lane and plowed into the back of my car doing $10,000 worth of damage. Even though 3 rims were written off after the sideways hit into the gutter, there was no problems with the wheels, they were still solidly affixed to the hub, no cracking, just scratches. A strong rim considering the hit they took. I've attached a photo of the car.
The rims and tyres were bought from Tyrepower at Claremont Ave, Greenacre and I can't recommend these guys enough. Great job and great prices!