It is the original.
The number is not the part, but the casting number which was common across all BOP & Chevy, A body drum brakes from 67 to 71/72.
The CT code identifies it as a Pontiac (and possibly Olds IIRC) application.
The Pontiac part number is 5458522 grp. 4.650
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2015 Chevy Express 
2024 Cadillac LYRIQ
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