On one side of the transaxle the rotation is trying to tighten the bolts, the other side it is trying to loosen them.
They may have been torqued to factory spec but if no loctite was applied they can come out over time. IMO, the bolts got loose and then got enough room to move and then sheared a few of them when it finally let go.
use the factory bolts from Suncoast or Pelican and Loctite and a torque wrench are your friends.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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