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All '99 Boxsters, with original engines, have dual row bearings.
Data from the IMS class action lawsuit showed less than 1% of OEM dual row bearings had failed.
Dual row OEM bearings fail typically when their outer seals degrade and leak.
Outer seals degrade when they are exposed to contaminated engine oil for long periods of time.
You may want to replace your dual row bearing before replacing the clutch if you haven't changed oil frequently (once a year or every 5000 miles whichever came first), you've let your car sit for long intervals between drives, or you/ve tended to take many drives where the engine hasn't run for 20 minutes or more at operating temperature.
If you're worried, replace the bearing now.
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