Ok, so two posts, and the same question twice.
Are you asking what size hex-head to use in a bolt on your bike? These bikes didn't have hex-head bolts on them originally. Probably 6mm if it's a larger bolt, but it could be 7 or 8mm as well. Smaller hex-head bolts for the engine cases tend to all be 5mm.
Beyond that - seriously, get out your wrenches and figure it out.