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A friend here in Thailand is restoring an Australian Holden car and wants to know if current US manufacturing calls for Imperial or Metric lug bolt patterns?



Any ideas?



Imperial or Metric pattern size?



thanks
 

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The Holden was exclusively Australian I thought, and would expect it to be a metric bolt pattern. (Aussi's chime in if different!) From what I know of the US Autos at this time, there isn't a definitive decision on the metric system. If they get their parts from overseas, they are likely to be metric, however, home built cars will more than likely still be imperial.



We have similar issues with cars in Canada - All the European and Asian cars are metric, while if they were built in the US, it's hit and mis whether it's going to be metric or not.



Are you trying to fit other wheels onto the Holden?
 

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Many of the Holdens over the past 15 years were built using GM parts and have SAE lug nuts.



Most any GM car from the mid 70's up has a mix of metric and SAE fasteners on it.
 
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