Originally Posted by andrewwynn

They are just normal non fancy bolts you can "buy them by the pound" at farm and fleet. There are a few that are short make sure you get those figured out: you can drive a long screw in until it bottoms to determine which holes are deep or shallow.

I would get grade five. The torque on M6 is normally 10 Nm or 7 ft·lb use a tool stretch a bolt make a leak.