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Here's the breakdown:
8 x 10mm = 2 for each wheel shaft
2 x 10mm = 2 for the drive Differential
The extra bearings are for if you got the All-Wheel Drive upgrade:
2 x 10mm = Differential in the AWD upgrade
2 x 6mm = Drive Shaft in the AWD upgrade
If you're running just 2WD and don't care about upgrading the Diff, then you and your friend can indeed split just 1 upgrade set.
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