I bought some rizoma mirrors and adapters and i dont have any of hte bolts that came with my bike originally. The bolts im talking about are the ones thtat are part of the clutch and brake master. 
I do have these bolts that the previous owner sent me, its an M8x1.0x30. the only problem i see is, if i go up a bolt size the head of the bolt is going to be larger, and it wont fit into the adapter.
I dont mind machining the bolt head to be smaller but still need to know what size they are. one of them should be a left hand thread right
			
			
			
				you talkin bout the opposite side of the clamps for your master cylinders that would have mirror mounts on them?? would have 2 bolts running through each? stock ones were black steel?
if so, those *should* be M6 socket cap bolts, parallel head.
if you need to me, i can run up th garage and measure length and head diameter on mine.. but be warned i am running coffins.
			
			
			
				them be the ones. but mine arent m6. they are much bigger. i have pee cup styles...