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"O" stands for Oldsmobile to differentiate from the corporate GM 12 bolt. They were only made in a 12 bolt variety so the 10 bolt you have is not a type "O".
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Dan
'77 Cutlass Supreme
'46 2 door
"The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.
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