VXOC Astra-J/GTC

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Hi, I am trying to find out the correct centre bore for the alloy wheels I have and the alloy wheels I have been looking at. The alloys on our car are 70.2mm according to Wheel-Size.com, and the alloys from a 2015 Zafira are 70.3 according to the same source. Does this sound about right, and if so I take it that spigot rings would not be required as the difference is so small. 

I have tried to look around but I keep on seeing different sizes, ranging from 70.1 to 70.3 for the 2.0cdti Astra, so I assume that maybe the 70.1 refers to the actual car hub? From the same search I can only find one pcd size for the 2015 Zafira, which is 5x115, does that sound correct also?
This will help you with the J centre bore but as for the zaffy I don't know

https://www.vxoc.org.uk/forum/Thread-Wheels-and-tyres