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I have a 10 A 68 LA Z/28 that is a factory spoiler car and it has both sets of emblem holes,the stripes are the narrow 68 style and they go all the way to the edge of the decklid,witch is still original paint.
My 69 Z28 with a 08C date code on the cowl tag has one set of holes lower under where the spoiler sits. 99.9% pretty sure my car is all original sheetmetal. Was wondering why the holes are there and read the thread. I love this site!!