Sorry I know nothing about ZF's.
When I did the hydraulic's for the clutch, I was not aware of any after market parts for building up the unit. Now adays you can buy them seperately, you donot have to buy them as a unit from Dodge for $300. There is also a replacement fitting for the slave so you can use a flared fitting and nut on it.
I would vote for using the factory master and slave, why reinvent the wheel.