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let's see if I learned my NastyZ28.com lesson... The hole for the value step will say "AU" and will be a round circle not an oval shaped, egg, "hole." Originals are rather tough to come by but "aftermarket" or should I say later editions are similar/incorrect but good for driver wheels/tires.
Good luck,
Dan
Did I get it right 2nd Gen Camaro guys?
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I am not sure I understood what you said. So I will take a shot at it: early 1970 wheels have a 1 by 5/8 oval valve stem hole, all others up to and including 1974 have a 1 by 13/16 oval hole and 1977 and up have a round hole.
Late 70-74
77 and up
Sorry, I don't have a early 70 wheel to show you.