brake / clutch slave "speed bleeders"

[a7xh7]

there seems to be some confusion what speed bleeder sizes the fd uses. from the information i've gathered it is:

front brakes - M7 x 1.0 pitch
rear brakes - M8 x 1.0 pitch

clutch slave - M8 x 1.0??? <--- this is where im confused. some claim that they are using this size, others say that they tried it and it will not fit. so what size do i order? or does it matter which year vehicle/if the slave has been replaced recently(different bleeder size?)