Well, I had originally intended to go with grade 10.9 M8x1.25x30 flange bolts, but Lowes' website lies. Instead, I picked up grade 12.9 hex cap head bolts, which have a max torque rating of 33 ft-lbs; this is more in line with my plans, and they should resist shearing better than the OEM bolts.
Additionally I'll be cutting the heads of the OEM bolts off to salvage the spacers, and drilling them out 1mm to fit over the 8mm bolt threads.
I'll keep you guys updated.
Joined the dark side.