Metric Bolt Strength

[gwbutler]

Hello all,

Does anyone know if it's essential to re-mount the flywheel on my 84 ksq with 
new 10mm 12.9 bolts as opposed to the 8.8's I just came home with. According 
to http://euler9.tripod.com/bolt-database/bolt-database10.html there's an 
enormous difference in parameters between the two grades. All I want to do is 
replace this ##$$@@@! clutch before the snow flys. TIA

Regards,

George B.