I have an '01 Boxster S. Arranged to have the IMSB replaced on the assumption that I probably had the single row. Of course, it's impossible to know until you remove the transmission, and as it turns out I have the double row. The labor is already a sunk cost and the bearing was already purchased, so I'm going ahead with the replacement; however if I had known I had the double row bearing, I would not have bothered with replacement.
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