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yeah all of those vintage slots I have seen for 8 lug applications are 16.5". that narrows down your tire selection alot.
check ebay, is all i can say. if you are so inclined, the aluminum wheels that come on new Silverado HD trucks are made by Alcoa, contracted out to GM. You can find takeoffs of these fairly easy online, for cheap too.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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