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Well my local parts store has them for over and undersize main bearings
As said earlier you want 0.010" undersize bearings. The package will often have -10 as a suffix, or just 10.

The individual bearing shells are also marked for size. The King bearing below is a 0.010" undersize bearing:

There are 0.001" and 0.002" oversized bearings, sometimes used to selective fit bearings to journals for a closer tolerance. These are called X and XX bearings, respectively. I'm not aware of over the counter oversized bearings for a SBC that would be 0.010".
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