3958640 was the original part number
it was discontinued and replaced with 3958638.
3958638 then showed up as use part number 3981921 by 1981.
3981921 is also the SS emblem for the 70-72 Camaro. This may be why the studs are shorter.
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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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