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I couldn't find the mainshaft small bearing and the countershaft small bearing, or any manufacturer numbers on 'em when I had mine apart so you might be stuck with Yamaha there (so far Power Parts Plus has had the best OEM prices I've found). But you can go to a bearing store to get the other two bearings, just make sure they are good quality German or Japanese and not from China or Taiwan:

 

Mainshaft big bearing - Koyo 83427

Countershaft big bearing - NSK 6305N/6305a5

 

You might have better luck than I did having them matched up, but if it helps the metric dimensions on the other two are:

 

Mainshaft small bearing - 21x30

Countershaft small bearing - 21x33

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