4 - 9 are 1 1/16 , you can use any off them, evo 7-9 has extra line come out to feed the clutch master as it doesnt have it own, evo1 - 6 reservoir bottle are the same, you cant mix and match evo1-6 reservoir on to the 7-9 as their difference, hope that clears everything up for every1 :blink: