I am not sure it matters what head mark you have on the bolt just as long as it has a head mark. Like any other part on the car many different head marks were used during assembly. My "P" head mark is from a low milage 1969 Z/28.
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1966 Corvette Coupe L79 Mossport Green
1969 Camaro Z/28 Hugger Orange
NCRS #22211
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