The OP is correct; i also upgraded from the stock vlsd to the OS Giken. The stock passenger side stub will NOT work with the OS Giken diff because it is too long. The stock passenger side stub actually inserts further into the diff than the driver side stub does for the stock diff. On the OS Giken diff, this is not required (nor possible), therefore the need for a shorter stub. Hence, two driver side stubs are required due to the length.
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