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For anyone wondering about the Taiho bearing set sizes and how it stacks up to the Toyota OEM markings, here is a spec sheet they sent me on the STD size bearing set that they manufacture.
The main bearings (M708A1) are on the upper end of the Mark 4 Toyota bearings and the connecting rod bearings (R708A) are on the lower end of the Mark 2 Toyota bearings.
The main bearings (M708A1) are on the upper end of the Mark 4 Toyota bearings and the connecting rod bearings (R708A) are on the lower end of the Mark 2 Toyota bearings.