To add to this, the no number open frames I have seen are the six spoke variety like the 927s and 928s. The 69-70 open frame alts I have seen on birds, Olds, vettes have a 5 spoke open frame. Also, I have seen aftermarket new chrome alternators also using this 6-spoke open frame.
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1968 Firebird 400HO convertible
1971 Trans Am 4-speed, white/blue
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