What's the correct hub size?

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Mudder

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I'm wanting to get some hubcentric rings and wondered what the correct hub size is? I've searched and found some differing opinions between 77.8 and 78.03. Wondered if anyone had a definitive answer?
 

quietpeen

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77.8 seems familiar but I'm not sure if that's it or not
 
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Mudder

Mudder

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Might as well ask also, any idea on what size lug nuts I'd need? I know they're 9/16 but there are about 50 different ones in that size.
 
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