Some people have speculated that the taller hubs could have been for a heavy duty brake option, but I have never seen evidence of that option existing. It shouldn't be too hard to find a used one, but they are now repopped and some places (Kore3) are making billet replacements.
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1967 Firebird Convertible Factory 400/4spd
Now 462/5spd Fuel Injected
http://1967firebird.atwebpages.com/
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