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