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#12
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This design started sometime in 70 not 69. your bolts should have a pinched point Recessed/flanged head. GM pt # 396014. And more specifically the M in a hex is late 70's early 80's from what I have seen. Original headmarkings for 69's would be RBW, E Anchor, $, 23 C and a few more. Hope this helps, Rich.
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