has Porsche let us down?

[BoxsterSteve]

Visually is the only way to determine which bearing you have installed.
Unfortunately, the trans, clutch and flywheel have to come off first and then the original bearing removed.
Vehicle and engine serials won't tell which bearing is in there. IIRC, somewhere on the LN or Pelican site, I can't remember which, there was an approximate breakdown by engine s/n, but even that's not guaranteed...