Im a little late to the party, but just FYI "8.8" bolts ARE NOT as strong as grade 8. More like grade 5. If it were me, I would replace those with grade 8 bolts. As far as grade 8 bolts shearing, all I can say is that is what was recomended for mounting the corbeaus in my 240z and spacers were also involved. Of course this is still at your own risk.
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