GM parts book show that part number 1231722 was switched in July 1974 over to 414188.
That lug nut in the original post looks like it has a rounded head or am I seeing things?
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1969 Camaro RS/SS Azure Turquoise
1969 Camaro Z/28 Azure Turquoise
1984 Camaro z/28 L69 HO 5 speed
1984 Camaro z/28 zz4 conversion
1987 Monte Carlo SS original owner
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